Undead anatomy I (Material component)

[Tyrion_86]

The spell undead anatomy need a piece of the criature whose form you plan to assume. If i want to use the form of Gaki (bestiary IV) for fly, is it necessary found and kill one of them firstly?

[VRMH]

No. A Spell Component Pouch would suffice, as those body parts have no listed value.

[Claxon]

Technically speaking, all you need is the spell component pouch.

However, your GM may rule (reasonably in my opinion) that you may need to either kill one or otherwise obtain a piece of its flesh (from a market perhaps).

You should ask your GM on how they intend to run it.