How does magic resistance affect spells like charm or mind bLast?

[Joonie73]

How is the outcome calculated on spells? Do spells like charm or mind bLast (or insert any other spells here) have an attack rating, which is pitted against magic resistance? If so, can I find it anywhere?

[Taqwus]

I don't know if it's changed since Dom I, but section 20.6.4 of the manual for the first game states that it's basically

(4 or 11) + floor(magic/2) + penetration bonuses + dice

versus

magic resistance incl. bonuses + drain scale + dice.

11 = most spells
4 = "easily resisted" spells, e.g. Master Enslave


I don't know where you'd find the penetration bonuses (e.g. for a Rune Smasher), haven't tried to build one in the demo yet.