Becoming the Monster

[Anthrowhale]

This is basically what I was looking for, thank you.

Depending on your application, it may be important that Undead, Fey, Elemental, Outsider, Plant, Ooze, Construct, [air], [earth], [fire], [water], [spirit], reptilian animals, spiders, telthors, spirit folk, and astral projectors can all be controlled via command undead, domain power command, planar binding, or spirit binding with no save or an interplanar save which may be nigh impossible to discover the source of.

It may also be relevant that some of the savage progression template classes like half-fiend or ghost provide a type change in a class format. Also, the Otherworldly feat provides a type change (to outsider) and the human heritage feat provides a type change (to humanoid).