Drawmij's Beneficent Polymorph

This spell endows the touched and willing creature with all the benefits of a polymorph self spell. The creature affected does not need to make a system shock roll to survive. While the first form taken by the creature is chosen by the caster, the creature is totally in control of its form changes for the remainder of the spell's duration, and can change form as often as it wishes, abiding by all the limitations of the polymorph self spell. The spell does not bestow any special abilities of a polymorphed form. The spell does not affect the creature's mental state in any way. When the creature returns to its original form, 1d12 hit points are restored and the spell ends.

The material component of the spell is a soft, silk caterpillar cocoon.