Alignment: Any Evil
Skills: Disguise 12 ranks, Hide 12 ranks, Move Silently 12 ranks
Feats: Improved Initiative, Stealthy, Track
Special: The character must kill an existing assassin of at least equal level to the applicant. The applicant cannot be aided by others in finding, identifying, or slaying the existing assassin.
I like the slightly increased ranks (although I think Disguise should still be lower than Hide/Move Silently). I don't like Track, but I do like Improved Initiative. Stealthy I'm neutral on, generally the skill bonus feats are better for classes that don't get a lot of skills, but do get a lot of feats (Fighter?).
As for the special requirement, while it would make it more difficult (and 'special') to become an assasin, it doesn't make sense. Assasins don't necessarily kill other assasins, they kill people for money. In fact, generally, I think Assasins are cowards, they tend to have a lot of advantages against their prey, they fight dirty, and they have no intention of a prolonged battle, just get in, strike in the night, get out.
I would consider:
Alignment: Any Evil
Skills: Disguise 6 ranks, Hide 10 ranks, Move Silently 10 ranks
Feats: Improved Initiative, Stealthy
Special: The character must kill someone for no other reason than to join the assasins.
Thats 6 more skill points and 2 feats more than the original class (one of them being unlikely on existing assasins). Part of the reason I wanted to keep the original prereqs is because then you can just update every existing assasin with new abilities, etc. By raising the pre-reqs you invalidate a lot of characters (and I realize that very few people will use this anyway).
Thanks for the input moritheil.
Technik