DracoDei
2007-11-03, 10:10 AM
EDIT: This is an old post and, as such, it is against the forum rules to respond to it. If you have comments, then please PM me, or start a new thread with a link in it to this one.
Still missing a few details, but definitely should be enough her to give the idea pretty clearly.
One of two more undead that occurred to me to add to my earlier trio of single (or two in the case of the Gus Snakes) organ undead (although this one also uses more than one organ...).
Floating Lungs
Open Spoiler below for main stat block for Fine through Small Floating Lungs.
{table="head"]~|Floating Lungs, Fine|Floating Lungs, Diminutive|Floating Lungs, Tiny|Floating Lungs, Small
Size and Type | Fine Undead | Diminutive Undead | Tiny Undead | Small Undead |
Hit Dice | 1/16d12 (1 hp) | 1/8d12 (1 hp) | 1/4d12 (1 hp) | 1/2d12 (3 hp) |
Speed | Fly 15 ft. (Good) | Fly 20 ft. (Good) |Fly 30 ft. (Good)|Fly 40 ft. (Good)|
Initiative | +4 | +3 | +2 | +1 |
AC |22 (+4 Dex, +8 size); touch 22; flat-footed 18|17 (+3 Dex, +4 size); touch 17; flat-footed 14|14 (+2 Dex, +2 size); touch 14; flat-footed 12|13 (+1 Dex, +1 size, +1 natural); touch 12; flat-footed 12
BAB | +0 | +0 | +0 | +0 |
Grapple | -21 | -16 | -12 | -7 |
Attack | None | None | None | None |
Space/Reach | 1/2 ft./0 ft. | 1 ft./0 ft. | 2 1/2 ft./0 ft. | 5 ft./0 ft. |
Special Attacks| Shout | Shout | Shout | Shout |
Special Qualities|Damage Reduction 3/Slashing, Dark Vision 60 ft., Hollowness, Sonic Resistance 10, Turn Resistance +2, Undead Traits|Damage Reduction 5/Slashing, Dark Vision 60 ft., Hollowness, Sonic Resistance 15, Turn Resistance +4, Undead Traits|Damage Reduction 10/Slashing, Dark Vision 60 ft., Hollowness, Sonic Resistance 20, Turn Resistance +6, Undead Traits|Damage Reduction 10/Slashing, Dark Vision 60 ft., Hollowness, Sonic Resistance 20, Turn Resistance +8, Undead Traits
Saves | Fort +0, Ref +4, Will +2 | Fort +0, Ref +3, Will +2 | Fort +0, Ref +2, Will +2 | Fort +0, Ref +1, Will +2 | Fort +0, Ref +0, Will +2
Abilities|Str 1, Dex 18, Con --, Int --, Wis 10, Cha 1|Str 2, Dex 17, Con --, Int --, Wis 10, Cha 1|Str 3, Dex 16, Con --, Int --, Wis 10, Cha 1|Str 4, Dex 13, Con --, Int --, Wis 10, Cha 1|Str 5, Dex 10, Con --, Int --, Wis 10, Cha 1
Skills | Move Silently +14 | Move Silently +13 | Move Silently +12 | Move Silently +11 | Move Silently +10
Feats | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B)
Environment | Any | Any | Any | Any
Organization | Any | Any | Any | Any
Challenge Rating| 1 | 2 | 4 | 7?
Treasure | None | None | None | None
Alignment |Always Neutral Evil|Always Neutral Evil|Always Neutral Evil|Always Neutral Evil|Always Neutral Evil||Always Neutral Evil
Advancement | None | None | 1/3 HD (Tiny) | None
Level Adjustment| ~ | ~ | ~ | ~ [/table]
Open Spoiler below for main stat block for Medium through Gargantuan Floating Lungs.
{table="head"]~|Floating Lungs, Medium|Floating Lungs, Large |Floating Lungs, Huge|Floating Lungs, Gargantuan
Size and Type | Medium Undead | Large Undead | Huge Undead |Gargantuan Undead
Hit Dice | 1d12 (6 hp) | 2d12 (13 hp) | 4d12 (26 hp) | 8d12 (52 hp)
Speed | Fly 50 ft (Good) |Fly 60 ft (Average)|Fly 60 ft (Average)|Fly 70 ft (Average)
Initiative | +0 | +0 | -1 | -2
AC|13 (+1 Dex, +2 natural); touch 11; flat-footed 12|11 (-1 Size, +2 natural); touch 9; flat-footed 11|11 (-2 size, -1 Dex, +3 natural); touch 8; flat-footed 11|7 (-4 size, -2 Dex, +3 natural); touch 4; flat-footed 7
BAB | +0 | +1 | +2 | +4
Grapple | -3 | +3 | +11 | +20
Attack | None | None | None | None
Space/Reach | 5 ft./0 ft. | 10 ft./0 ft. | 15 ft./0 ft | 20 ft./0 ft
Special Attacks| Shout | Shout | Shout | Shout
Special Qualities|Damage Reduction 15/Slashing, Dark Vision 60 ft., Hollowness, Sonic Resistance 30, Turn Resistance +10, Undead Traits|Damage Reduction 15/Slashing, Dark Vision 90 ft., Hollowness, Sonic Resistance 30, Turn Resistance +12, Undead Traits|Damage Reduction 20/Slashing, Dark Vision 120 ft., Hollowness, Sonic Immunity, Turn Resistance +14, Undead Traits|Damage Reduction 20/Slashing, Dark Vision 180 ft., Hollowness, Sonic Immunity, Turn Resistance +16, Undead Traits
Saves | Fort +0, Ref +0, Will +2 | Fort +0, Ref +0, Will +3 | Fort +1, Ref +1, Will +4 | Fort +2, Ref +2, Will +6
Abilities|Str 5, Dex 10, Con --, Int --, Wis 10, Cha 1|STR 7, Dex 10, Con --, Int --, Wis 10, Cha 1|STR 9, Dex 8, Con --, Int --, Wis 10, Cha 1|STR 11, Dex 6, Con --, Int --, Wis 10, Cha 1
Skills | Move Silently +10 | Move Silently +10 | Move Silently +9 | Move Silently +8
Feats | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B), Hover(B) | Ability Focus(Shout)(B), Hover(B) | Ability Focus(Shout)(B), Hover(B)
Environment | Any | Any | Any | Any
Organization | Any | Any | Any | Any
Challenge Rating| 10? | 13? | 13? | 15?
Treasure | None | None | None | None
Alignment |Always Neutral Evil|Always Neutral Evil|Always Neutral Evil|Always Neutral Evil
Advancement | None | 3 HD (Large) | 5-7 HD (Huge) |9+ HD (Gargantuan)
Level Adjustment| ~ | ~ | ~ | ~ [/table]
A pair of yellowish, lobed bags covered in an intricate network of blood-vessels hanging from a tube shaped like an inverted "Y" float before you.
Floating Lungs are the pairs of Lungs of corpses reanimated through dark and sinister magic. (See "Creation" below)
Combat
Because of their utter lack of intelligence, the instructions given to a newly created pair of Floating Lungs must be very simple. They are generally end up simply ???. If they are within the threatened area of an opponent they may (depending on how carefully they were instructed) take a 5 foot float (or for the ones that can do so and still release their pulse) making withdraw action directly away from it before launching their attack for that round.
Hollowness(Ex): After damage reduction, apply the following further reductions: Halve bludgeoning damage and reduce piercing damage to 1 point per hit.
Shout(Sn): A pair of Floating Lungs (which is a single creature!) can create something like the effect of a Shout or Shout, Greater spell with the specifics as follows. A Fortitude save is allowed for half damage and to negate the stunning and deafening(except in the case of the Huge and Gargantuan ones in which case it only makes the deafness last the duration listed after the slash rather than being permanent) conditions.
{table="head"]Size|Range|Damage|Deafness Duration|Stun Duration|DC|Frequency |Size of Source Creature
Fine | 15 feet | 1d6/2d6 |
1d3 |
N/A| 12 |Every Round | Diminutive or Tiny
Diminutive | 20 feet | 3d6/5d6 |
2d3 |
N/A| 14 |Every Round | Small
Tiny | 30 feet | 5d6/8d6 |
2d6 |
N/A| 16 |Every Round | Medium
Small | 40 feet | 7d6/11d6 |
2d8 |
N/A| 18 |Every Round | Large
Medium | 60 feet | 10d6/15d6 |
4d4 |
1 | 20 |Every Round | Huge
Large(2 HD)| 90 feet | 13d6/20d6 |
4d6 |
1d3| 22 |Every Round | Gargantuan
Large(3 HD)| 105 feet | 15d6/22d6 |
4d8 |
1d4| 23 |Every Round | Gargantuan w/ 2 EHD
Huge(4 HD) | 125 feet | 17d6/25d6 | Permanent / 1d4 |
1d6| 24 |Every Other Round| Colossal
Huge(5 HD) | 135 feet | 18d6/26d6 | Permanent / 1d4 |
1d6| 24 |Every Other Round| Colossal w/ 2 EHD
Huge(6 HD) | 150 feet | 19d6/27d6 | Permanent / 1d6 |
1d6| 25 |Every Other Round| Colossal w/ 4 EHD
Huge(7 HD) | 165 feet | 20d6/28d6 | Permanent / 1d6 |
1d6| 25 |Every Other Round| Colossal w/ 6 EHD
Gargantuan | 180 feet | 21d6/30d6 | Permanent / 2d4 |
1d8| 26 |Every Other Round| Colossal+
[/table]
Special: Floating Lungs are occasionally returned to the rib-cages from which they came (tied in place with a network of string or rope in the case of skeletal undead). In such a case the larger undead becomes somewhat subject to critical hits, sneak attack, and other precision based damage provided that they are dealt in the form of piercing damage. In such a case a confirmed critical hit may be elected by the attacker to deal its NORMAL (NOT critical hit!) damage to the Floating Lungs instead of dealing any damage what-so-ever to the larger undead.
Skills: Floating Lungs move quietly through the air and only breath when using their shout attack, they receive a +10 racial bonus to Move Silently.
Usage:
Use them alone or mixed in with other mindless undead. Generally they will be deployed behind ground troops, giving them some measure of protection until they can float upward (still out of range of even reach weapons) and start blasting away without hitting the other troops on their side.
Creating a pair of Floating Lungs
First the lungs of one or more creatures of at least small size must be harvested, each pair requiring a Heal check with a DC of 20. The pair of lungs must be reasonably undecayed and mostly whole and the creature must have had a circulatory system that included a pair of lungs (even if decidedly unequally proportioned such as the lungs of a snake). Then Sound Burst (for Fine Floating Lungs) or Shout (for Diminutive or Tiny Floating Lungs), or Shout, Greater (Floating Lungs of Small and larger sizes, for Large and larger ones it must be cast once per HD), and either Fly, or Overland Flight must be cast once over each Pair of Lungs to be animated. Wind Walk may ber substituted for Fly and in such a case it fulfills that requirement for as many pairs of Floating Lungs as the number of targets it could normally affect. Finally, either Animate Dead or Create Undead, Lesser must be cast. The material components for the spell must inserted down the throat past the vocal cords to rest inside each pair of lungs to be animated. Each such casting (regardless of which spell is used) may create up to 2 HD worth of Floating Lungs per caster level (The Desecrate spell doubles this limit). Animate Dead can not create a pair of Floating Lungs of over 20 HD. The size of the Floating Lungs is two size classes smaller than the size of the creature the lungs were taken from (to a minimum Fine Size). Floating Lungs have hit dice equal to the minimum listed for a pair of Floating Lungs of that size, plus extra hit dice equal to 1/2 the number of extra hit dice above the minimum that the creature it was harvested from needed to achieve its size class (up to the maximum listed HD a Floating Lungs of the particular size category it is at may be advanced to).
The remaining corpse is still suitable for animation into most types of undead. Especially note that with the right skill checks, spells, etc it is possible to generate a Skeleton, a pair of Floating Lungs (which is a single undead), a Hopping Stomach (http://www.giantitp.com/forums/showthread.php?p=3301315),an Empty Skin (http://www.giantitp.com/forums/showthread.php?t=44544), a Gut Snake (http://www.giantitp.com/forums/showpost.php?p=3295643&postcount=8), a Dark Heart (http://www.giantitp.com/forums/printthread.php?t=64187), and a contribution toward a Fat Glob (http://www.giantitp.com/forums/showthread.php?t=128873) from a single corpse.
As is usually the case the CR's are pretty much just guesses.
Spellcasting:
Add 1 Diminutive Floating Lungs to the list of things that may be summoned with Summon Undead II (and multiples for later spells in the series).
Add 1 Tiny Floating Lungs to the list of things that may be summoned with Summon Undead IV (and multiples for later spells in the series).
EDIT: Linking these for cross-referencing purposes, although I am not sure if the Spell is a good idea at all since it reduces the flavor by bypassing the skill checks.
Gut spell (http://www.giantitp.com/forums/showthread.php?t=29539)by The Vorpal Tribble
Cat Skinning Blade (http://www.giantitp.com/forums/printthread.php?t=166119) by DM-Ninja
Still missing a few details, but definitely should be enough her to give the idea pretty clearly.
One of two more undead that occurred to me to add to my earlier trio of single (or two in the case of the Gus Snakes) organ undead (although this one also uses more than one organ...).
Floating Lungs
Open Spoiler below for main stat block for Fine through Small Floating Lungs.
{table="head"]~|Floating Lungs, Fine|Floating Lungs, Diminutive|Floating Lungs, Tiny|Floating Lungs, Small
Size and Type | Fine Undead | Diminutive Undead | Tiny Undead | Small Undead |
Hit Dice | 1/16d12 (1 hp) | 1/8d12 (1 hp) | 1/4d12 (1 hp) | 1/2d12 (3 hp) |
Speed | Fly 15 ft. (Good) | Fly 20 ft. (Good) |Fly 30 ft. (Good)|Fly 40 ft. (Good)|
Initiative | +4 | +3 | +2 | +1 |
AC |22 (+4 Dex, +8 size); touch 22; flat-footed 18|17 (+3 Dex, +4 size); touch 17; flat-footed 14|14 (+2 Dex, +2 size); touch 14; flat-footed 12|13 (+1 Dex, +1 size, +1 natural); touch 12; flat-footed 12
BAB | +0 | +0 | +0 | +0 |
Grapple | -21 | -16 | -12 | -7 |
Attack | None | None | None | None |
Space/Reach | 1/2 ft./0 ft. | 1 ft./0 ft. | 2 1/2 ft./0 ft. | 5 ft./0 ft. |
Special Attacks| Shout | Shout | Shout | Shout |
Special Qualities|Damage Reduction 3/Slashing, Dark Vision 60 ft., Hollowness, Sonic Resistance 10, Turn Resistance +2, Undead Traits|Damage Reduction 5/Slashing, Dark Vision 60 ft., Hollowness, Sonic Resistance 15, Turn Resistance +4, Undead Traits|Damage Reduction 10/Slashing, Dark Vision 60 ft., Hollowness, Sonic Resistance 20, Turn Resistance +6, Undead Traits|Damage Reduction 10/Slashing, Dark Vision 60 ft., Hollowness, Sonic Resistance 20, Turn Resistance +8, Undead Traits
Saves | Fort +0, Ref +4, Will +2 | Fort +0, Ref +3, Will +2 | Fort +0, Ref +2, Will +2 | Fort +0, Ref +1, Will +2 | Fort +0, Ref +0, Will +2
Abilities|Str 1, Dex 18, Con --, Int --, Wis 10, Cha 1|Str 2, Dex 17, Con --, Int --, Wis 10, Cha 1|Str 3, Dex 16, Con --, Int --, Wis 10, Cha 1|Str 4, Dex 13, Con --, Int --, Wis 10, Cha 1|Str 5, Dex 10, Con --, Int --, Wis 10, Cha 1
Skills | Move Silently +14 | Move Silently +13 | Move Silently +12 | Move Silently +11 | Move Silently +10
Feats | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B)
Environment | Any | Any | Any | Any
Organization | Any | Any | Any | Any
Challenge Rating| 1 | 2 | 4 | 7?
Treasure | None | None | None | None
Alignment |Always Neutral Evil|Always Neutral Evil|Always Neutral Evil|Always Neutral Evil|Always Neutral Evil||Always Neutral Evil
Advancement | None | None | 1/3 HD (Tiny) | None
Level Adjustment| ~ | ~ | ~ | ~ [/table]
Open Spoiler below for main stat block for Medium through Gargantuan Floating Lungs.
{table="head"]~|Floating Lungs, Medium|Floating Lungs, Large |Floating Lungs, Huge|Floating Lungs, Gargantuan
Size and Type | Medium Undead | Large Undead | Huge Undead |Gargantuan Undead
Hit Dice | 1d12 (6 hp) | 2d12 (13 hp) | 4d12 (26 hp) | 8d12 (52 hp)
Speed | Fly 50 ft (Good) |Fly 60 ft (Average)|Fly 60 ft (Average)|Fly 70 ft (Average)
Initiative | +0 | +0 | -1 | -2
AC|13 (+1 Dex, +2 natural); touch 11; flat-footed 12|11 (-1 Size, +2 natural); touch 9; flat-footed 11|11 (-2 size, -1 Dex, +3 natural); touch 8; flat-footed 11|7 (-4 size, -2 Dex, +3 natural); touch 4; flat-footed 7
BAB | +0 | +1 | +2 | +4
Grapple | -3 | +3 | +11 | +20
Attack | None | None | None | None
Space/Reach | 5 ft./0 ft. | 10 ft./0 ft. | 15 ft./0 ft | 20 ft./0 ft
Special Attacks| Shout | Shout | Shout | Shout
Special Qualities|Damage Reduction 15/Slashing, Dark Vision 60 ft., Hollowness, Sonic Resistance 30, Turn Resistance +10, Undead Traits|Damage Reduction 15/Slashing, Dark Vision 90 ft., Hollowness, Sonic Resistance 30, Turn Resistance +12, Undead Traits|Damage Reduction 20/Slashing, Dark Vision 120 ft., Hollowness, Sonic Immunity, Turn Resistance +14, Undead Traits|Damage Reduction 20/Slashing, Dark Vision 180 ft., Hollowness, Sonic Immunity, Turn Resistance +16, Undead Traits
Saves | Fort +0, Ref +0, Will +2 | Fort +0, Ref +0, Will +3 | Fort +1, Ref +1, Will +4 | Fort +2, Ref +2, Will +6
Abilities|Str 5, Dex 10, Con --, Int --, Wis 10, Cha 1|STR 7, Dex 10, Con --, Int --, Wis 10, Cha 1|STR 9, Dex 8, Con --, Int --, Wis 10, Cha 1|STR 11, Dex 6, Con --, Int --, Wis 10, Cha 1
Skills | Move Silently +10 | Move Silently +10 | Move Silently +9 | Move Silently +8
Feats | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B) | Ability Focus(Shout)(B), Hover(B) | Ability Focus(Shout)(B), Hover(B) | Ability Focus(Shout)(B), Hover(B)
Environment | Any | Any | Any | Any
Organization | Any | Any | Any | Any
Challenge Rating| 10? | 13? | 13? | 15?
Treasure | None | None | None | None
Alignment |Always Neutral Evil|Always Neutral Evil|Always Neutral Evil|Always Neutral Evil
Advancement | None | 3 HD (Large) | 5-7 HD (Huge) |9+ HD (Gargantuan)
Level Adjustment| ~ | ~ | ~ | ~ [/table]
A pair of yellowish, lobed bags covered in an intricate network of blood-vessels hanging from a tube shaped like an inverted "Y" float before you.
Floating Lungs are the pairs of Lungs of corpses reanimated through dark and sinister magic. (See "Creation" below)
Combat
Because of their utter lack of intelligence, the instructions given to a newly created pair of Floating Lungs must be very simple. They are generally end up simply ???. If they are within the threatened area of an opponent they may (depending on how carefully they were instructed) take a 5 foot float (or for the ones that can do so and still release their pulse) making withdraw action directly away from it before launching their attack for that round.
Hollowness(Ex): After damage reduction, apply the following further reductions: Halve bludgeoning damage and reduce piercing damage to 1 point per hit.
Shout(Sn): A pair of Floating Lungs (which is a single creature!) can create something like the effect of a Shout or Shout, Greater spell with the specifics as follows. A Fortitude save is allowed for half damage and to negate the stunning and deafening(except in the case of the Huge and Gargantuan ones in which case it only makes the deafness last the duration listed after the slash rather than being permanent) conditions.
{table="head"]Size|Range|Damage|Deafness Duration|Stun Duration|DC|Frequency |Size of Source Creature
Fine | 15 feet | 1d6/2d6 |
1d3 |
N/A| 12 |Every Round | Diminutive or Tiny
Diminutive | 20 feet | 3d6/5d6 |
2d3 |
N/A| 14 |Every Round | Small
Tiny | 30 feet | 5d6/8d6 |
2d6 |
N/A| 16 |Every Round | Medium
Small | 40 feet | 7d6/11d6 |
2d8 |
N/A| 18 |Every Round | Large
Medium | 60 feet | 10d6/15d6 |
4d4 |
1 | 20 |Every Round | Huge
Large(2 HD)| 90 feet | 13d6/20d6 |
4d6 |
1d3| 22 |Every Round | Gargantuan
Large(3 HD)| 105 feet | 15d6/22d6 |
4d8 |
1d4| 23 |Every Round | Gargantuan w/ 2 EHD
Huge(4 HD) | 125 feet | 17d6/25d6 | Permanent / 1d4 |
1d6| 24 |Every Other Round| Colossal
Huge(5 HD) | 135 feet | 18d6/26d6 | Permanent / 1d4 |
1d6| 24 |Every Other Round| Colossal w/ 2 EHD
Huge(6 HD) | 150 feet | 19d6/27d6 | Permanent / 1d6 |
1d6| 25 |Every Other Round| Colossal w/ 4 EHD
Huge(7 HD) | 165 feet | 20d6/28d6 | Permanent / 1d6 |
1d6| 25 |Every Other Round| Colossal w/ 6 EHD
Gargantuan | 180 feet | 21d6/30d6 | Permanent / 2d4 |
1d8| 26 |Every Other Round| Colossal+
[/table]
Special: Floating Lungs are occasionally returned to the rib-cages from which they came (tied in place with a network of string or rope in the case of skeletal undead). In such a case the larger undead becomes somewhat subject to critical hits, sneak attack, and other precision based damage provided that they are dealt in the form of piercing damage. In such a case a confirmed critical hit may be elected by the attacker to deal its NORMAL (NOT critical hit!) damage to the Floating Lungs instead of dealing any damage what-so-ever to the larger undead.
Skills: Floating Lungs move quietly through the air and only breath when using their shout attack, they receive a +10 racial bonus to Move Silently.
Usage:
Use them alone or mixed in with other mindless undead. Generally they will be deployed behind ground troops, giving them some measure of protection until they can float upward (still out of range of even reach weapons) and start blasting away without hitting the other troops on their side.
Creating a pair of Floating Lungs
First the lungs of one or more creatures of at least small size must be harvested, each pair requiring a Heal check with a DC of 20. The pair of lungs must be reasonably undecayed and mostly whole and the creature must have had a circulatory system that included a pair of lungs (even if decidedly unequally proportioned such as the lungs of a snake). Then Sound Burst (for Fine Floating Lungs) or Shout (for Diminutive or Tiny Floating Lungs), or Shout, Greater (Floating Lungs of Small and larger sizes, for Large and larger ones it must be cast once per HD), and either Fly, or Overland Flight must be cast once over each Pair of Lungs to be animated. Wind Walk may ber substituted for Fly and in such a case it fulfills that requirement for as many pairs of Floating Lungs as the number of targets it could normally affect. Finally, either Animate Dead or Create Undead, Lesser must be cast. The material components for the spell must inserted down the throat past the vocal cords to rest inside each pair of lungs to be animated. Each such casting (regardless of which spell is used) may create up to 2 HD worth of Floating Lungs per caster level (The Desecrate spell doubles this limit). Animate Dead can not create a pair of Floating Lungs of over 20 HD. The size of the Floating Lungs is two size classes smaller than the size of the creature the lungs were taken from (to a minimum Fine Size). Floating Lungs have hit dice equal to the minimum listed for a pair of Floating Lungs of that size, plus extra hit dice equal to 1/2 the number of extra hit dice above the minimum that the creature it was harvested from needed to achieve its size class (up to the maximum listed HD a Floating Lungs of the particular size category it is at may be advanced to).
The remaining corpse is still suitable for animation into most types of undead. Especially note that with the right skill checks, spells, etc it is possible to generate a Skeleton, a pair of Floating Lungs (which is a single undead), a Hopping Stomach (http://www.giantitp.com/forums/showthread.php?p=3301315),an Empty Skin (http://www.giantitp.com/forums/showthread.php?t=44544), a Gut Snake (http://www.giantitp.com/forums/showpost.php?p=3295643&postcount=8), a Dark Heart (http://www.giantitp.com/forums/printthread.php?t=64187), and a contribution toward a Fat Glob (http://www.giantitp.com/forums/showthread.php?t=128873) from a single corpse.
As is usually the case the CR's are pretty much just guesses.
Spellcasting:
Add 1 Diminutive Floating Lungs to the list of things that may be summoned with Summon Undead II (and multiples for later spells in the series).
Add 1 Tiny Floating Lungs to the list of things that may be summoned with Summon Undead IV (and multiples for later spells in the series).
EDIT: Linking these for cross-referencing purposes, although I am not sure if the Spell is a good idea at all since it reduces the flavor by bypassing the skill checks.
Gut spell (http://www.giantitp.com/forums/showthread.php?t=29539)by The Vorpal Tribble
Cat Skinning Blade (http://www.giantitp.com/forums/printthread.php?t=166119) by DM-Ninja