Favored Magic Foe

 
Prerequisite(s):Knowledge 6+ ranks (in appropriate skill; see below) or favored enemy class feature.
 
Benefit: Choose a creature type for which you have the favored enemy class feature, or one associated with a Knowledge skill in which you have at least 6 ranks (see below). If you choose humanoid or outsider, you must also choose a subtype from Table 3-14: Ranger Favored Enemies (PH 47). You gain a +1 bonus on caster level checks to overcome the spell resistance of the chosen creature type, and such creatures take a -1 penalty on saves against your spells and spell-like abilities.
 
Creature: Associated Type Knowledge Skill
 
Aberration: Dungeoneering, Animal, Nature
 
Construct: Arcana
 
Dragon: Arcana
 
Elemental: the Planes
 
Fey: Nature
 
Giant: Nature
 
Humanoid (any):
 
Magical Beast:
 
Monstrous Humanoid:
 
Ooze: Dungeoneering
 
Outsider: the Planes
 
Plant: Nature
 
Undead: Religion
 
Vermin: Nature
 
Special: You can take this feat multiple times. Each time you take this feat, you choose a new creature type (or subtype, in the case of humanoids or outsiders).
 
Source: Complete Mage