This spell affects any single person it is cast upon. The term person includes any bipedal human, demihuman, or humanoid of man-size or smaller, such as brownies, dryads, dwarves, elves, gnolls, gnomes, goblins, half-elves, halflings, half-orcs, hobgoblins, humans, kobolds, lizard men, nixies, orcs, pixies, sprites, troglodytes, and others. Thus, a 10th-level Fighter could be charmed, but an ogre could not. The person receives a Save vs. Spell to avoid the effect.
If the spell recipient fails his/her Save vs. Spell, he/she regards the caster as a trusted friend and ally to be heeded and protected. The caster can give him/her orders, and the charmed individual will carry them out as quickly as possible.
If the caster harms, or attempts to harm, the charmed person by some overt action, or if Dispel Magic is successfully cast upon the charmed person, the charm spell is broken. If two or more charm effects simultaneously affect a creature, the most recent charm takes precedence. Note that the subject has full memory of the events that took place while he/she was charmed. Also note that you cannot have a charmed creature leave the area where he/she was charmed.