School: Chronomancy (Transmutation)
(Intended for use with the Chronomancer subclass)
Duration: Determined by caster: up to 10 minutes / level, or up to 20 minutes / level if reversed

Age Animal:
Upon casting this spell, the caster manipulates time in respect to a creature of animal Intelligence or lower. A creature ages up to one month per caster level. The amount of aging must be decided before the spell is cast. Aging occurs at a rate of one month of aging per 10 minutes of time passed. The creature must make Death Saves until either a single success, or two failures occurs. It gains +1 to this roll for every 5 Hit Dice it has. If it fails the save twice, it dies of shock in 1d4 rounds. Any actions (combat, flight, and so on) the creature takes during the process occur at half its normal ability (attacks as if at half its Hit Dice and loses half its attacks, base speed is halved, and so on). This spell does not allow the creature to exceed its maximum natural size.

The material component necessary for this spell is a piece of bio-matter from the type of animal to be affected. If the Chronomancer touches the animal during the spell, no material component is required.

Rewind Animal:
The reverse, Rewind Animal, reduces the age of the affected creature by up to one month per caster's level, to a minimum age of one month. The amount of change must be decided before the spell is cast, and the reversal occurs at a rate of one month of de-aging every 20 minutes of time passed.

The rules for material component are the same.

Based on 2e AD&D spell Accellerate Animal Growth, from the Chronomancer suppliment (TSR 9506).