[Tyrant]

Some of the mythological foul-spawn types are on the list for sure- i remember Chimeras, and i think Coakatrice as well. You can heal the feeble mind affliction if that happens, but it's difficult.

Is it worth it? Not in a general sense, but perhaps situationally. It's what i call a "toolkit spell." MA Man, for instance, might want to roll the dice on a few Crones to try to get some mages that have more hit point or a faster move rate. I've also heard people talk about using it on an immobile pretender chassis.