How do resistances stack?

[Chris Woods]

Hey all,

Just got back into ToME after a long hiatus, and made a fighter dude. He's now about level 23 (which is about where I *always* die) and I've been trying to make him really resilient.

Reading previous posts, it sounds like resistances add, or specifically "resist all" is added to "resist X" when calculating damage reduction. Is this actually true? Like, if I have cold resist: 70% and resist all: 30% am I essentially immune to cold damage? Or is the formula DAMAGE * (1 - 0.7) * (1-0.3)? Or is it just the max of either?

Thanks! I know this has come up before, but there never seemed to be any consensus as to how this works.

EDIT: Oh, and what does "Increases damage: Blight +5%" mean? Does that mean I do 5% more blight damage (which is sorta useless to a fighter) or that my damage is increased by 5% and it is of type "blight"?

Chris Woods

[lukep]

Your display already adds "resist all" and "resist cold" together, so you would have 70% resistance, the maximum. Increased damage types only affect their own damage type, so increased blight damage would not help your fighter unless you have a weapon of Corruption, or something similar.

[ghostbuster]

A similar question I wanted to ask. If I ignore 10% of fire resistance of my targets (with wildfire for instance), what happens with a foe that has 100% resistance fire and 10% resistance all? Does he get 10% fire damage or 0 damage?

Edit: I have experimented and it is possible to deal fire damage to a unique with 100% fire res and 35% res all with only 10% fire resistance ignored. I havent checked in the source, but probably resistances are computed, capped to 100 and then reduction is applied for ignored resistances (which is obviously the more coherent way).