A new Modding challenge! Now on to Part 2!

[Phoenix-D]

The ability is most certainly working. Setting it to -100 means NO damage is applied at all, and that's how it works out.

Works for shields and armor as well; tested at 90% reduction, reduced 350 damage hit to 35, as expected..

EDIT: and it just plain works. Positive values increase damage, negative ones decrease. If I had to guess, PES, your Damage Type and the one the engines are using don't match.