Favored Enemy

For example a ranger selects Goblinoid as his favored enemy at first level and gets the +2 bonuses listed above. At fifth level, the ranger is able to select Giant and will get a +4 damage bonus to both Goblinoid and Giant enemies. At tenth level he gets to select yet another class of enemy and the damage bonus on all of them increases to +6.

The following monster types are available to be chosen:
 * Aberration - Beholder, Rust Monster, Illithid (Mind Flayer), Xyzzy
 * Animal - Dog, Wolf
 * Chaotic Outsider
 * Construct - Inevitable, Golem, Defender, Titan
 * Dragon - Velah
 * Dwarf
 * Elemental - Fire Elemental, Earth Elemental, Air Elemental
 * Elf
 * Evil Outsider - Fire Reaver, Flesh Render, Hell Hound, Thaarak Hound, Devils, Orthons, Suulomades, Arraetrikos, Lailat
 * Giant - Giants, Ogre, Troll, Sor'jek, Storm Reaver
 * Gnoll
 * Goblinoid - Bugbears, Hobgoblin
 * Halfling
 * Human
 * Lawful Outsider
 * Magical Beast - Winter Wolf
 * Monstrous Humanoid - Minotaur, Gargoyle, Wildman
 * Ooze - Ooze, Puddings, Gelatinous Cube, Living Spells
 * Orc
 * Reptilian - Kobold, Troglodyte
 * Undead - Ghoul, Ghast, Skeleton, Spectre, Wight, Wraith, Zombie, Black Abbot, Sor'jek
 * Vermin - Scorpion, Spider

Special: Rangers can not select a favored enemy type that will allow their damage bonuses against Mephits of neutral alignment.

Note: Dungeons and Dragons Online implementation of monsters may differ slightly from their PnP version.

For more information on Dungeons & Dragons monsters, you can visit the D20 SRD: Monster page.