D20:Hit Dice Creature Statistic

====Hit Dice====
This line gives the creature?s number and type of Hit Dice, and lists any bonus hit points. A parenthetical note gives the average hit points for a creature of the indicated number of Hit Dice. A creature?s Hit Dice total is also treated as its level for determining how spells affect the creature, its rate of natural healing, and its maximum ranks in a skill.

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System Reference Document -> Reading Creature Entries (SRD)