Well, I know what the Assassin build should be but, I want to add some more fun for my assassin. (No Endurance, and No Thief or Steed Stone.) If you like to add some suggestions for me, do not hesitate.

You want real challenge? How about a no weapon assassin. Only fists and poisoned apples.

Hmm... I like it don't get me wrong, but I like to paint my enemies blood on the wall and not have shattered skulls and the smell of vomit in the morning wondering why I'm doing this.

Well, you could supplement with illusion. paralyze your victim in place while you pummel them. command their friends to kill assassinate them in your name.

But if it is blood you are looking for, then maybe use blades but no poison. that would lead to more challenge and more blood on the wall.