Animal Growth (R)

When this spell is cast, the druid causes all animals, up to a maximum of 8, within a 2" square area to grow to twice their normal size. 

The effects of this growth are doubled hit dice (with resultant improvement in attack potential) and doubled damage in combat. 

The spell lasts for 2 melee rounds for each level of experience of the druid casting the spell. 

Note that the spell is particularly useful in conjunction with a charm person or [mammal] or a speak with animals spell.

The reverse reduces animal size by one half, and likewise reduces hit dice, attack damage, etc.

Except as noted above, and for the fact that the material component of the spell is a pinch of powdered bone, this is the same as the fifth level druid spell animal growth (q.v.).