Spell resistance

From DDO wiki

Spell Resistance

Spell resistance (SR) is a special anti-spell defense possessed by some characters and monsters. Spell resistance is like an Armor Class against magical attacks, in that it adds an extra roll that the caster has to make for his magic to "hit" that target.

Spell resistance only matters if the spell's subject actually has it and the spell being cast is one that can be stopped by SR. In DDO, most purely damage-causing spells ignore SR.

To affect a creature that has spell resistance, you must make a caster level check at least equal to the creature's SR:

1d20 + caster level + spell penetration bonuses (include feats, enhancements and items)

Spell resistance and saving throws are separate mechanics. A spell that gets past SR may still be saved against.

Spell resistance does not stack.