Willpower penalty

[Dlightfull]

Any idea what could cause -1 WI for my DE Wizard?

I don't have any items doing this, i even stripped naked and dropped everything and still have the penalty.

Edit: It's even seen on the char screen as a red -1. No corruptions that i have give this penalty as well.

Edit no.2: I am stupid, it's the penalty for the number of corruptions. I got chaotic from lawful and so my 2 corruptions gave me the penalty to Wi.