But look, I gave the formula, every DM ought to follow it.
not crazy - no, no, no.
This is CO, we're supposed to do that.
Let's say a party is 7th level, with some randomish distribution of classes.
They find a Wraith.
The try to kill it, and mostly succeed.
But somebody dies.
No intention of doing this intentionally.
One round later, it's Monty Python skit time: "I'm not dead yet!"
Guys lets keep campaigning.
New Wraith + Old Character build = compatability issues.
Some now dead feats
Some now useless powers.
Retraining happens slowly.
Completely different party composition tactics.
Wraith - "I used to be a Killer, now I sulk."