Looking for monsters with high HD and low CR

[Wacky89]

If any1 knows any monsters with high HD and low CR of one of the following types I would be most grateful:

giant, humanoid, magical beast, or monstrous humanoid

[Thurbane]

Having a quick look at core, a Hieracosphinx is CR 5 with 9HD. You could advance it to 12HD for CR 6.

How low a CR are you looking for?

[Wacky89]

4 or 5 with at least double hd as CR, preferable with advancement.

[Mr Adventurer]

Animals are great for this: advance them a bunch at a 4:1 HD:CR ratio, then slap on a template. Spellwarped is great.

[skyth]

For what it's worth, dinosaurs often have low CR for their HD.

[Raezeman]

this site might be able to help you
http://monsterfinder.dndrunde.de

you can do a search based on CR and then look at the column of HD what you find appropriate.

[Zancloufer]

http://www.d20srd.org/srd/improvingMonsters.htm#increasingHitDice

By Default Aberration, construct, elemental, fey, giant, humanoid, ooze, plant, undead and vermin monster types gain 1 CR per 4 HD. Which on it's own is insane. Just get a good template or base creature of one of those types and you can pump them pretty high.

There's a pile more there that still have a 3:1 ratio, and if the class is "Un-Associated" with the creature type it's only 1 CR per two class levels.

Had a 48 HD giant that was "Only CR 18". Mind you I would be careful how far you advance them. a 4:1 HD:CR ratio might make sense at first but it can get out of hand FAST if you abuse it. Especially if you tack on full casters on something that shouldn't be a caster. Epic level Bear Wizards with ~17CR isn't really a CR ~17 encounter. . .