it seems that my endurance stat is lowering in my ninja characters. My first character (ninja) went all the down to 1,so I started another ninja and it seems his stat of endurance is lowering slowly as well. Any thoughts? Is there a cheat that I could use to get my old ninja back? I don't know how I'm going to get my new ninja high enough. Thanks in advance.

You lose a point of endurance every time you cast "Raise Dead" on a character.

If your character dies, you should go to a temple to raise him. This way he won't lose an Endurance point.

(Same could apply to Resurrection)

IIRC, a Divine Intervention spell will not give -1 Endurance, and can be used in place of Raise Dead or Resurrect. Of course it's terribly expensive to cast. I think Resurrect does give -1 Endurance.