Spell penetration

Spell Penetration check
Spell Resistance (SR) is a special anti-spell defense possessed by some creatures. Spell Resistance is an additional layer of defense against most non-damaging magical attacks, in that it adds an extra roll that the caster has to make for his magic to "land" on that target.

Spell Resistance only matters if the spell's creature actually has it, and the spell being cast is one that can be stopped by Spell Resistance. In DDO, spells that most purely cause damage ignore Spell Resistance.

Spell Penetration is the act of trying to penetrate that defense. Spell penetration roll is a caster level check, i.e. you roll 1d20 + caster level. This roll is modified by additional bonuses listed below.

Spell Penetration feats

 * Spell Penetration feat gives +2 to die roll
 * Greater Spell Penetration feat gives another +2 to die roll
 * Past Life: Wizard grants +2 to the die roll, it can be acquired up to 3 times for a maximum of +6
 * Past Life: Favored Soul grants +1 to the die roll, it can be acquired up to 3 times for a maximum of +3

Spell Penetration enhancements

 * Improved Spell Penetration class enhancements gives +1, +2 or +3 to die roll
 * Elven Arcanum (Regular non-drow elves only) can grant up to +4

Spell Penetration item enchantment
The Spell Penetration item enchantment comes in 3 different flavors:
 * Minor Spell Penetration gives a +1 bonus
 * Spell Penetration (with no additional qualifier) gives a +2 bonus
 * Greater Spell Penetration gives a +3 bonus

In addition, an item's Spell Penetration bonus applies only for spells up to a given level, for instance a Spell Penetration III Dagger will give a +2 bonus for spells of the levels 1, 2, and 3.