question about pain skull -- and morale

[ganjatron]

Do this - double click your unit so you see its card. Now, hover over the morale icon (smiley face, neutral, etc.) It should show you exactly what the boost is giving you as well as what is causing the morale effect. I think generally, it affects your attack, defense, and critical strike ratings. It will show you their default rating in (parentheses) and the modified rating plainly next to it.

I'm sorry but I don't know the exact formula... and what is pain skull?