What would you give a ninja class?

[Evilhalfling]

a boot to the head.

 

[Evilhalfling]

In 3e 1 negative level per other ninja present.
In 4e can not die unless last blow is by another ninja.

although actually I have a convention game (4e) with ninja
10 ninja minions, attack the party, when there were two left, one yelled "there can be only one" and killed the other. He then became an elite.