I'm asking exactly because i've tried 60 times x every type of skull and then reviving it w/ pearl. Not even one holstaur.It's been so long since I've used the necromancy book, but I think the outcome of it is always a skeleton with a random look, with the exception of the head and amount of arms used. If you want a holstaur, use the life pearl found in SlimeP kingdom on a skeleton progeny and keep on retrying until RNG gives you a holstaur.
So I thought maybe someone got some holstaur somehow.