Partial HD Skeletons and Zombies

[Fero]

I am trying to figure out how the Skeleton and Zombie templates apply to partial HD creatures. I know that class levels round down to 1, but am not sure if partial HD get rounded up.

For example, is does a skeleton of a 1/4 HD bat have 1/4 HD or is it a 1 HD monster? Similarly, is a zombie bat a 1/2 HD, 1 HD, or 2 HD monster? If a 5th lvl Cleric who can control 20 HD of undead wants nothing but zombie bats, can they control 10, 20, or 40?

Thank you

[Inevitability]

Drop any Hit Dice gained from class levels (to a minimum of 1) and raise remaining Hit Dice to d12s. If the creature has more than 20 Hit Dice, it can’t be made into a skeleton by the animate dead spell.


Drop any Hit Dice from class levels (to a minimum of 1), double the number of Hit Dice left, and raise them to d12s.


A bat skeleton would have 1/4 HD, a bat zombie would have 1/2 HD.

[ShurikVch]

Related question: what if the caster who created those Undead has Improved Animation feat (gives animated undead +1 on attack and damage rolls, and +1 HD)?
How many HD would it have - 1½?

[NontheistCleric]

The next HD up from 1/2 HD is simply 1 HD, so it would have 1 HD. The fractions are simply a way to represent having less HD than a single HD without going into negative HD, because that would make no sense.