d20 SRD :: Monsters :: Improving Monsters

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.

SIZE INCREASES

A creature may become larger when its Hit Dice are increased (the new size is noted parenthetically in the monster's Advancement entry).

A size increase affects any special ability the creature has that is affected by size. Increased size also affects a creature's ability scores, AC, attack bonuses, and damage values as indicated on the tables below.

Table: Changes to Statistics by Size
Old Size*	New Size	Str	Dex	Con	Natural Armor	AC/ Attack
Fine	Diminutive	Same	-2	Same	Same	-4
Diminutive	Tiny	+2	-2	Same	Same	-2
Tiny	Small	+4	-2	Same	Same	-1
Small	Medium	+4	-2	+2	Same	-1
Medium	Large	+8	-2	+4	+2	-1
Large	Huge	+8	-2	+4	+3	-1
Huge	Gargantuan	+8	Same	+4	+4	-2
Gargantuan	Colossal	+8	Same	+4	+5	-4
*Repeat the adjustment if the creature moves up more than one size.

Table: Increased Damage By Size
Old Damage (Each)*	New Damage
1d2	1d3
1d3	1d4
1d4	1d6
1d6	1d8
1d8	2d6
1d10	2d8
2d6	3d6
2d8	3d8
* Repeat the adjustment if the creature moves up more than one size category.

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