Warlock Invocation
Level: Lesser, 4th lv.
Components: V
Casting Time: 1 standard action
Range: 60 feet
Duration: 1day/lv
Saving Throw: Will
Spell Resistance: Yes

You can beguile a creature within 60 feet. The creature must succeed on a Will save or instantly come to regard you as its comrade. This is a language-dependent ability. Other than these differences, this ability works as the charm monster spell. You can never have more than one target charmed at a time
with this ability. If a second creature is charmed, you lose your hold on the first creature.

(Complete Arcane, Page 134)