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Hit Dice

A Hit Die (HD) is a d8 unless otherwise specified.

Hit Dice can be used to determine the hit points of a non-player character or a monster. (See below.)

They can also be used to grant an ATK bonus to non-player character or monster. The number of HD a monster or non-player character may usually be considered equal to their level.

Hit Points from Hit Dice

To determine Hit Points of a non-player character or monster, do whichever the following you prefer:

1. Check the monster's stats to see if they have a specific number of hit points. If they do, this is the best method.
2. Multiply the number of hit dice by 4 (or by 5 to create stronger enemies.) This is fast, simple, and consistent.
3. Roll all of the hit dice and use the total. This is the most traditional method. It's very random, which is less consistent and less predictable for players and referee.

Bonus ATK from Hit Dice

A non-player character or monster gets a bonus to ATK equal to their number of Hit Dice (unless they are assigned a specific bonus in their stat block or description.)

A monster with 3 HD would have a bonus of +3.

Ability Scores derived from Hit Dice

A non-player character or monster has a default ability score equal to 10 + HD when an ability score is needed for an opposed check.

A monster with 3 HD usually has 13 Strength, 13 Dexterity, 13 Intelligence, etc.

Modify their ability scores as needed, when appropriate. A gigantic, rampaging hippo with 2 HD probably doesn't have an intelligence as high as 12, for example.