Create custom ultimate form for mobs

Hi everyone !
I have a question, the no soul pets (lydian, panthera, angel etc;..) has an ultimate form, that you can find in the cob. files. But, when you go in the cob. files for arlequeen (for exemple) she hasn't an ultimate form. How is posible to inser some lines in the cob to write the ultimate form .dds ? When i add some lines, obviously server crash.

But we have witch (erzatz) who has the ultimate form .dds


And arlequeen only the normale form, but not the ultimate

If someone has the answer would be very nice :)
thanks a lot ! And sorry for my english !

Moving this to the proper forum.

it feels like you are looking at pet skins, and the missing 1 would be the joker, that doesnt have a staged skin because it is not a pet that is staged, it is used as food for staging with higher success.

No it's not for Joker, but all of souls pets. I can't add a custom ultimate form. Like Basilic, he hasn't ultimate form. When is stade 1, he has just reflects adds on his skins, but no news colors or something. And it's for all Souls pets like this :/