Greater Physical Evolution Feat 12
Source Pathfinder Advanced Player's Guide
Prerequisites Arcane Evolution or Primal Evolution
You hold a deep understanding of the innate fundamental structures of the physical world, and you can enforce your will upon that structure as far as your own blood is concerned.
Once per day, you can use a sorcerer spell slot to cast any common polymorph battle form spell of the spell slot's level as if it were a signature spell in your repertoire.
If you have Arcane Evolution, you can also choose from any battle form spell in your spellbook.
If you have Primal Evolution, you can Cast a Spell listed in that feat using the extra spell slot the feat grants (instead of a sorcerer spell slot).
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
SorcererThis indicates abilities from the sorcerer class.