Muster Support doesn't work with multiple different types of phantoms

Well it should bc it does work with different skeletons. For phantoms it only adds the damage once (not once for each phantom gem like I think it should).

IF all phantoms are one 'type' then skeletons definitely are as well (persistent skeletal miniions, all of them are). IF skeletons don't all belong to one type (they don't for the purpose of muster) then distinct phantoms shouldn't as well.