grand hex abominate

[stormborn125]

how the smeg does this work? creature become an abomination i get that what else, can i mutate my familiar into a panthicore (panther + manticore), choosing what feats and traits it has as well as it's attributes? how long does it last or is it as long as i wish it

[avr]

It's as baleful polymorph, so permanent - and your familiar risks losing its mind.

Pathfinder doesn't trust you to make up your own aberration. Your GM might and if so fine, talk to them, but by default you have to pick an existing aberration. The target gets modifiers as per monstrous physique IV. This modifies ability scores and gives some monster special abilities but not feats.

If something tells you it works as a couple of spells, try looking up those spells first.