odigity
2014-12-21, 12:02 AM
Master of Reactions A Mini-Guide
Sources: Player's Handbook, Elemental Evil Player's Companion, Sword Coast Adventurer's Guide, Xanathar's Guide to Everything
See Also: The Bonus Guide (A Mini-Guide to Bonus Actions) (http://www.giantitp.com/forums/showthread.php?546126-The-Bonus-Guide-(A-Mini-Guide-to-Bonus-Actions))
Opportunity Attacks (OpAtks) vs Other Reaction Attacks
While there are some abilities that grant you a reaction attack (like Mage Slayer), unless it specifically says "Opportunity Attack", it's not one even though it looks a lot like one, and is almost as good.
The only optional ability in the game that grants new criteria for triggering a genuine OpAtk is Polearm Master. That means an OpAtk enhancer (like Sentinel's 0-speed clause) will work the standard OpAtk, as well as the OpAtk granted by Polearm Master, but not the non-OpAtk reaction attack granted by Mage Slayer.
It also leads to the humorous conclusion that Sentinel's 0-speed clause will not work Sentinel's own reaction attack grant. :)
Color Legend
Feat -> Gray
Spell -> Violet
Ability -> Black
Universal Reaction Triggers
Dismount dismount/land on feet when mount is knocked prone
Identifying a Spell Int (Arcana) DC 15 + spell's level Xanathar's
Opportunity Attacks get attack vs foe who leaves your reach
Ready Action user-defined trigger and action
Optional Reaction Triggers
Absorb Elements when take elemental dmg -> resistance, +1d6..9d6 dmg next melee Druid/Ranger/Sorcerer/Wizard 1 Xanathar's
Arcane Deflection when hit/fail save -> +2 AC/+4 save Wizard 2 (War Magic) Xanathar's
Armor of Hexes when hit by target -> 50% negate hit Warlock 10 (Hexblade) Xanathar's
Aura of the Guardian when ally within 10'/30' takes dmg -> take that dmg Paladin 7 (Redemption) Xanathar's
Beguiling Defenses bounce charm back at initiator Warlock 10 (Archfey)
Bend Luck spend 2 sorcery pts to add/subtract 1d4 from someone's attack/save/check Sorcerer 6 (Wild Magic)
Blade of Flourish : Mobile Flourish move your speed to catch up after pushing target Bard 3 (Swords) Xanathar's
Bountiful Luck ally rerolls a 1 Halfling Xanathar's
Combat Inspiration +1d6..1d12 to AC vs one attack Bard 3 (Valor)
Counterspell counter a spell being cast Sorcerer/Warlock/Wizard 5
Cutting Words -1d6..1d12 to opponent's attack roll, damage roll, or ability check Bard 3 (Lore)
Dampen Elements grant resistance vs one energy attack Cleric 6 (Nature)
Defensive Duelist add prof bonus to AC vs one attack if wielding finesse weapon (Dex 13)
Deflect Missles deflect/catch-and-return one missle Monk 3
Divine Allegiance when adjacent ally takes dmg -> you take instead Paladin 7 (Crown) Sword Coast
Entropic Ward impose disadvantage on one attack vs you, then gain advantage vs attacker Warlock 6 (Great Old One)
Fade Away when take dmg -> invisible until end of next turn Gnome Xanathar's
Feather Fall safe landing for <=5 creatures for 1m Bard/Sorcerer/Wizard 1
Giant Killer get attack vs large or larger creature who attacks you Ranger 3 (Hunter)
Hellish Rebuke 1d10+1d10/slot lvl fire to attacker Tiefling 3, Warlock 1
Illusory Self negate an attack Wizard 10 (Illusionist)
Instinctive Charm divert attack to another target Wizard 6 (Enchanter)
Mage Slayer get melee weapon attack vs adjacent foe who casts a spell
Mantle of Inspiration when benefiting from Bard's Mantle -> move your speed without provoking OpAtk Bard 3 (Glamour) Xanathar's
Misdirection redirect attack to adjacent creature providing you cover Rogue 13 (Mastermind) Xanathar's
Misty Escape teleport 60' when damaged Warlock 6 (Archfey)
Opportunist get attack vs foe who hit adjacent ally Monk 17 (Shadow)
Orcish Fury after Relentless Endurance -> make one weapon attack Half-Orc Xanathar's
Parry (Maneuver) reduce damage of one melee attack Fighter 3 (Battle Master), Martial Adept feat
Polearm Master get OpAtk when someone enters your reach with Glaive/Halberd/Quarterstaff
Primordial Ward when take elemental dmg -> gain immunity until end of next turn Druid 11 Xanathar's
Projected Ward negate some damage within 30' Wizard 6 (Abjurer)
Protection (Fighting Style) use shield to impose disadvantage on one attack vs adjacent ally Fighter 1, Paladin 2
Raging Storm Barbarian 14 (Storm Herald) Xanathar's
Desert when creature hits you, Dex save or 1/2 Barbarian lvl dmg (fire)
Sea when hit creature, Str save or knock prone
Tundra when aura effect activated, Str save or speed 0 until start of your next turn
Rebuke the Violent when ally hit -> attacker takes equal dmg (radiant), Wis save for 1/2 Paladin 3 (Redemption) Xanathar's
Retaliation get attack vs adjacent foe who harms you Barbarian 14 (Berserker)
Riposte (Maneuver) get attack vs adjacent foe who attacks you and misses Fighter 3 (Battle Master), Martial Adept feat
Second Chance when hit -> force reroll Halfling Xanathar's
Sentinel get attack vs adjacent foe who attacks someone else
Sentinel at Death's Door when your or ally within 30' suffers crit -> turn into normal hit Cleric 6 (Grave) Xanathar's
Shadowy Dodge impose disadvantage on attack roll against you Ranger 15 (Gloom Stalker) Xanathar's
Shield +5 AC until next turn, castable *after* hit! Sorcerer/Wizard 1
Shield Master take no damage instead of half damage on successful Dex save
Skirmisher when enemy ends turn adjacent -> move 1/2 speed without OpAtk Rogue 3 (Scout) Xanathar's
Slayer's Counter when saving -> weapon attack vs target, success -> save succeeds Ranger 15 (Monster Slayer) Xanathar's
Slow Fall reduce falling damage Monk 4
Song of Defense when take dmg -> spend spell slot, reduce dmg by slot level * 5 Wizard 10 (Bladesinging) Sword Coast
Soul Cage when humanoid within 60' dies -> trap soul in cage Warlock/Wizard 11 Xanathar's
Soul of Vengeance get attack vs Enmity target when it makes an attack Paladin 15 (Vengeance)
Spectral Defense when take dmg from attack -> resistance Ranger 15 (Horizon Walker) Xanathar's
Spell Thief steal a spell that affects you Rogue 17 (Arcane Trickster)
Spirit Shield reduce dmg to ally within 30' by 2d6..4d6 Barbarian 6 (Ancestral Guardian) Xanathar's
Spirit Totem : Hawk Spirit grant advantage to attack against target in aura Druid 2 (Shepherd) Xanathar's
Stand Against the Tide redirect melee attack that misses you to another creature Ranger 15 (Hunter)
Stone's Endurance when take dmg -> reduce by 1d12 + Con bonus Goliath Elemental Evil
Storm's Fury when hit by melee, do Sorcerer level dmg (lightning), Str save or pushed back 20' Sorcerer 14 (Storm Sorcery) Xanathar's
Strength before Death when reduced to 0 hp -> immediately take extra turn Fighter 18 (Samurai) Xanathar's
Sun Shield when hit with melee -> do 5 + Wis bonus dmg (radiant) Monk 17 (Sun Soul) Xanathar's
Tomb of Levistus (Invocation) when take dmg -> +10 thp/Warlock lvl, vulnerable to fire, speed 0, incapactitated (all til end of next turn) Warlock 5 Xanathar's
Uncanny Dodge halve damage from one attack Rogue 5, Ranger 15 (Hunter)
Warding Flare/Improved Flare impose disadvantage on one attack Cleric 1/6 (Light)
Warding Maneuver when you or adjacent ally hit, and wielding melee weapon or shield -> +1d8 AC and resistance Fighter 7 (Cavalier) Xanathar's
War God's Blessing (Channel Divinity) grant +10 on attack roll Cleric 6 (War)
Wrath of the Storm 2d8 lightning/thunder vs adjacent foe who hits you Cleric 1 (Tempest)
OpAtk Enhancers
Relentless Avenger move up to half speed when you hit someone using an OpAtk Paladin 7 (Vengeance)
Sentinel drop foe's speed to 0 when you hit them with an OpAtk; prevent foe from negating your OpAtk trigger via the Disengage action
War Caster cast single-target spell instead of melee attack for OpAtk
Ally Reactions
Commander's Strνke (Maneuver) allow ally to use their reaction to make one weapon attack Fighter 3 (Battle Master)
Inspiring Surge when action surge -> grant 1-2 allies within 60' reaction attacks Fighter 10/17 (Purple Dragon Knight) Sword Coast
Maneuverνng Attack (Maneuver) allow ally to use their reaction to move half speed without OpAtk from target Fighter 3 (Battle Master)
Power Word Heal ally can use reaction to stand up from prone Bard 17
Familiars: When you cast a touch spell while your familiar is within 100', it can use its reaction to deliver it.
Preventing Reactions
Arms of Hadar no reactions until its next turn Warlock 1
Confusion no reactions Bard/Cleric (Knowledge)/Druid/Sorcerer/Wizard 7, Paladin 13 (Oathbreaker)
Dissonant Whispers must use reaction to move away Bard/Warlock (Great Old Ones) 1
Open Hand Technique when hit with Flurry -> target can't take reactions until end of your next turn Monk 3 (Open Hand)
Shocking Grasp no reactions until its next turn Sorcerer/Wizard 1
Slow no reactions Druid (Arctic)/Sorcerer/Wizard 5
Staggering Smite no reactions until end of its next turn Paladin 13
Conditions
Incapacitated (included by Paralyzed, Petrified, Stunned, Unconscious) no reactions
Surprised can't take a reaction until your first turn of combat ends
Turned no reactions Cleric 2, Paladin 3
Special
Vigilant Defender "In combat, you get a special reaction that you can take once on every creatures turn, except your turn. You can use this special reaction only to make an opportunity attack, and you cant use it on the same turn that you take your normal reaction." Fighter 18 (Cavalier) Xanathar's
Revision Log
2017-12-23 Updated styling. Added this revision log. Updated to include Elemental Evil Player's Companion, Sword Coast Adventurer's Guide, Xanathar's Guide to Everything.
2017-12-24 Added Commander's Strνke, Maneuverνng Attack, Power Word Heal. Added sections for Ally Reactions, Preventing Reactions.
2017-12-25 Corrected "Attack of Opportunity" -> "Opportunity Attack".
2018-01-07 Fixed Arcane Deflection description. (credit: ImproperJustice)
Sources: Player's Handbook, Elemental Evil Player's Companion, Sword Coast Adventurer's Guide, Xanathar's Guide to Everything
See Also: The Bonus Guide (A Mini-Guide to Bonus Actions) (http://www.giantitp.com/forums/showthread.php?546126-The-Bonus-Guide-(A-Mini-Guide-to-Bonus-Actions))
Opportunity Attacks (OpAtks) vs Other Reaction Attacks
While there are some abilities that grant you a reaction attack (like Mage Slayer), unless it specifically says "Opportunity Attack", it's not one even though it looks a lot like one, and is almost as good.
The only optional ability in the game that grants new criteria for triggering a genuine OpAtk is Polearm Master. That means an OpAtk enhancer (like Sentinel's 0-speed clause) will work the standard OpAtk, as well as the OpAtk granted by Polearm Master, but not the non-OpAtk reaction attack granted by Mage Slayer.
It also leads to the humorous conclusion that Sentinel's 0-speed clause will not work Sentinel's own reaction attack grant. :)
Color Legend
Feat -> Gray
Spell -> Violet
Ability -> Black
Universal Reaction Triggers
Dismount dismount/land on feet when mount is knocked prone
Identifying a Spell Int (Arcana) DC 15 + spell's level Xanathar's
Opportunity Attacks get attack vs foe who leaves your reach
Ready Action user-defined trigger and action
Optional Reaction Triggers
Absorb Elements when take elemental dmg -> resistance, +1d6..9d6 dmg next melee Druid/Ranger/Sorcerer/Wizard 1 Xanathar's
Arcane Deflection when hit/fail save -> +2 AC/+4 save Wizard 2 (War Magic) Xanathar's
Armor of Hexes when hit by target -> 50% negate hit Warlock 10 (Hexblade) Xanathar's
Aura of the Guardian when ally within 10'/30' takes dmg -> take that dmg Paladin 7 (Redemption) Xanathar's
Beguiling Defenses bounce charm back at initiator Warlock 10 (Archfey)
Bend Luck spend 2 sorcery pts to add/subtract 1d4 from someone's attack/save/check Sorcerer 6 (Wild Magic)
Blade of Flourish : Mobile Flourish move your speed to catch up after pushing target Bard 3 (Swords) Xanathar's
Bountiful Luck ally rerolls a 1 Halfling Xanathar's
Combat Inspiration +1d6..1d12 to AC vs one attack Bard 3 (Valor)
Counterspell counter a spell being cast Sorcerer/Warlock/Wizard 5
Cutting Words -1d6..1d12 to opponent's attack roll, damage roll, or ability check Bard 3 (Lore)
Dampen Elements grant resistance vs one energy attack Cleric 6 (Nature)
Defensive Duelist add prof bonus to AC vs one attack if wielding finesse weapon (Dex 13)
Deflect Missles deflect/catch-and-return one missle Monk 3
Divine Allegiance when adjacent ally takes dmg -> you take instead Paladin 7 (Crown) Sword Coast
Entropic Ward impose disadvantage on one attack vs you, then gain advantage vs attacker Warlock 6 (Great Old One)
Fade Away when take dmg -> invisible until end of next turn Gnome Xanathar's
Feather Fall safe landing for <=5 creatures for 1m Bard/Sorcerer/Wizard 1
Giant Killer get attack vs large or larger creature who attacks you Ranger 3 (Hunter)
Hellish Rebuke 1d10+1d10/slot lvl fire to attacker Tiefling 3, Warlock 1
Illusory Self negate an attack Wizard 10 (Illusionist)
Instinctive Charm divert attack to another target Wizard 6 (Enchanter)
Mage Slayer get melee weapon attack vs adjacent foe who casts a spell
Mantle of Inspiration when benefiting from Bard's Mantle -> move your speed without provoking OpAtk Bard 3 (Glamour) Xanathar's
Misdirection redirect attack to adjacent creature providing you cover Rogue 13 (Mastermind) Xanathar's
Misty Escape teleport 60' when damaged Warlock 6 (Archfey)
Opportunist get attack vs foe who hit adjacent ally Monk 17 (Shadow)
Orcish Fury after Relentless Endurance -> make one weapon attack Half-Orc Xanathar's
Parry (Maneuver) reduce damage of one melee attack Fighter 3 (Battle Master), Martial Adept feat
Polearm Master get OpAtk when someone enters your reach with Glaive/Halberd/Quarterstaff
Primordial Ward when take elemental dmg -> gain immunity until end of next turn Druid 11 Xanathar's
Projected Ward negate some damage within 30' Wizard 6 (Abjurer)
Protection (Fighting Style) use shield to impose disadvantage on one attack vs adjacent ally Fighter 1, Paladin 2
Raging Storm Barbarian 14 (Storm Herald) Xanathar's
Desert when creature hits you, Dex save or 1/2 Barbarian lvl dmg (fire)
Sea when hit creature, Str save or knock prone
Tundra when aura effect activated, Str save or speed 0 until start of your next turn
Rebuke the Violent when ally hit -> attacker takes equal dmg (radiant), Wis save for 1/2 Paladin 3 (Redemption) Xanathar's
Retaliation get attack vs adjacent foe who harms you Barbarian 14 (Berserker)
Riposte (Maneuver) get attack vs adjacent foe who attacks you and misses Fighter 3 (Battle Master), Martial Adept feat
Second Chance when hit -> force reroll Halfling Xanathar's
Sentinel get attack vs adjacent foe who attacks someone else
Sentinel at Death's Door when your or ally within 30' suffers crit -> turn into normal hit Cleric 6 (Grave) Xanathar's
Shadowy Dodge impose disadvantage on attack roll against you Ranger 15 (Gloom Stalker) Xanathar's
Shield +5 AC until next turn, castable *after* hit! Sorcerer/Wizard 1
Shield Master take no damage instead of half damage on successful Dex save
Skirmisher when enemy ends turn adjacent -> move 1/2 speed without OpAtk Rogue 3 (Scout) Xanathar's
Slayer's Counter when saving -> weapon attack vs target, success -> save succeeds Ranger 15 (Monster Slayer) Xanathar's
Slow Fall reduce falling damage Monk 4
Song of Defense when take dmg -> spend spell slot, reduce dmg by slot level * 5 Wizard 10 (Bladesinging) Sword Coast
Soul Cage when humanoid within 60' dies -> trap soul in cage Warlock/Wizard 11 Xanathar's
Soul of Vengeance get attack vs Enmity target when it makes an attack Paladin 15 (Vengeance)
Spectral Defense when take dmg from attack -> resistance Ranger 15 (Horizon Walker) Xanathar's
Spell Thief steal a spell that affects you Rogue 17 (Arcane Trickster)
Spirit Shield reduce dmg to ally within 30' by 2d6..4d6 Barbarian 6 (Ancestral Guardian) Xanathar's
Spirit Totem : Hawk Spirit grant advantage to attack against target in aura Druid 2 (Shepherd) Xanathar's
Stand Against the Tide redirect melee attack that misses you to another creature Ranger 15 (Hunter)
Stone's Endurance when take dmg -> reduce by 1d12 + Con bonus Goliath Elemental Evil
Storm's Fury when hit by melee, do Sorcerer level dmg (lightning), Str save or pushed back 20' Sorcerer 14 (Storm Sorcery) Xanathar's
Strength before Death when reduced to 0 hp -> immediately take extra turn Fighter 18 (Samurai) Xanathar's
Sun Shield when hit with melee -> do 5 + Wis bonus dmg (radiant) Monk 17 (Sun Soul) Xanathar's
Tomb of Levistus (Invocation) when take dmg -> +10 thp/Warlock lvl, vulnerable to fire, speed 0, incapactitated (all til end of next turn) Warlock 5 Xanathar's
Uncanny Dodge halve damage from one attack Rogue 5, Ranger 15 (Hunter)
Warding Flare/Improved Flare impose disadvantage on one attack Cleric 1/6 (Light)
Warding Maneuver when you or adjacent ally hit, and wielding melee weapon or shield -> +1d8 AC and resistance Fighter 7 (Cavalier) Xanathar's
War God's Blessing (Channel Divinity) grant +10 on attack roll Cleric 6 (War)
Wrath of the Storm 2d8 lightning/thunder vs adjacent foe who hits you Cleric 1 (Tempest)
OpAtk Enhancers
Relentless Avenger move up to half speed when you hit someone using an OpAtk Paladin 7 (Vengeance)
Sentinel drop foe's speed to 0 when you hit them with an OpAtk; prevent foe from negating your OpAtk trigger via the Disengage action
War Caster cast single-target spell instead of melee attack for OpAtk
Ally Reactions
Commander's Strνke (Maneuver) allow ally to use their reaction to make one weapon attack Fighter 3 (Battle Master)
Inspiring Surge when action surge -> grant 1-2 allies within 60' reaction attacks Fighter 10/17 (Purple Dragon Knight) Sword Coast
Maneuverνng Attack (Maneuver) allow ally to use their reaction to move half speed without OpAtk from target Fighter 3 (Battle Master)
Power Word Heal ally can use reaction to stand up from prone Bard 17
Familiars: When you cast a touch spell while your familiar is within 100', it can use its reaction to deliver it.
Preventing Reactions
Arms of Hadar no reactions until its next turn Warlock 1
Confusion no reactions Bard/Cleric (Knowledge)/Druid/Sorcerer/Wizard 7, Paladin 13 (Oathbreaker)
Dissonant Whispers must use reaction to move away Bard/Warlock (Great Old Ones) 1
Open Hand Technique when hit with Flurry -> target can't take reactions until end of your next turn Monk 3 (Open Hand)
Shocking Grasp no reactions until its next turn Sorcerer/Wizard 1
Slow no reactions Druid (Arctic)/Sorcerer/Wizard 5
Staggering Smite no reactions until end of its next turn Paladin 13
Conditions
Incapacitated (included by Paralyzed, Petrified, Stunned, Unconscious) no reactions
Surprised can't take a reaction until your first turn of combat ends
Turned no reactions Cleric 2, Paladin 3
Special
Vigilant Defender "In combat, you get a special reaction that you can take once on every creatures turn, except your turn. You can use this special reaction only to make an opportunity attack, and you cant use it on the same turn that you take your normal reaction." Fighter 18 (Cavalier) Xanathar's
Revision Log
2017-12-23 Updated styling. Added this revision log. Updated to include Elemental Evil Player's Companion, Sword Coast Adventurer's Guide, Xanathar's Guide to Everything.
2017-12-24 Added Commander's Strνke, Maneuverνng Attack, Power Word Heal. Added sections for Ally Reactions, Preventing Reactions.
2017-12-25 Corrected "Attack of Opportunity" -> "Opportunity Attack".
2018-01-07 Fixed Arcane Deflection description. (credit: ImproperJustice)