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Increasing Hit Dice

As its Hit Dice increase, a creature’s attack bonuses and saving throw modifiers might improve. It gains more feats and skills, depending on its type, as shown on Table: Creature Improvement by Type.

Note that if a creature acquires a character class, it improves according to its class, not its type.

Table: Creature Improvement by Type
  Hit Die Attack Bonus Good Saving Throws Skill Points*
Aberration d8 HD x3/4 (as cleric) Will 2 + Int mod per HD
Animal d8 HD x3/4 (as cleric) Fort, Ref (and sometimes Will) 2 + Int mod per HD
Construct d10 HD x3/4 (as cleric) — 2 + Int mod per HD**
Dragon d12 HD (as fighter) Fort, Ref, Will 6 + Int mod per HD
Elemental d8 HD x3/4 (as cleric) Ref (Air, Fire), or Fort (Earth, Water) 2 + Int mod per HD
Fey d6 HD x1/2 (as wizard) Ref, Will 6 + Int mod per HD
Giant d8 HD x3/4 (as cleric) Fort 2 + Int mod per HD
Humanoid d8 HD x3/4 (as cleric) Varies (any one) 2 + Int mod per HD
Magical beast d10 HD (as fighter) Fort, Ref 2 + Int mod per HD
Monstrous humanoid d8 HD (as fighter) Ref, Will 2 + Int mod per HD
Ooze d10 HD x3/4 (as cleric) — 2 + Int mod per HD**
Outsider d8 HD (as fighter) Fort, Ref, Will 8 + Int mod per HD
Plant d8 HD x3/4 (as cleric) Fort 2 + Int mod per HD**
Undead d12 HD x1/2 (as wizard) Will 4 + Int mod per HD**
Vermin d8 HD x3/4 (as cleric) Fort 2 + Int mod per HD**
All types have a number of feats equal to 1 + 1 per 3 Hit Dice.
* As long as a creature has an Intelligence of at least 1, it gains a minimum of 1 skill point per Hit Die.
** Creatures with an Intelligence score of “—” gain no skill points or feats.
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