The Free Kingdoms

[Bjorn]

I plan on getting a cloak of charisma +2. Since I have a cha of 15 and it's my primary casting stat, I don't think it's unreasonable.

Absolutely fine.

As for the fatigue, it lasts as long as normal fatigue - considering most enemies will get killed within a few rounds anyway, I don't think that's a big deal.

It does change the interpretation of the spell's duration, though.  1 round/level sounds low until you realize that the major effect of the spell will last the rest of the day.

Of course, it also makes it a spell that will hit the PCs harder than the NPCs. ;)

A fort save seems to make the most sense for resisting tiredness - the vast majority of necromantic effects require fort saves, anyway.

I think we'll stick to the RAW for now.  It isn't obviously broken as is, and I'd like to give it a shot before we try to tinker with it.