Prerequisite: Character level 6th.
Benefits: Having this feat enables the character to attract loyal companions and devoted followers, subordinates who assist her. See the table below for what sort of cohort and how many followers the character can recruit.
Leadership Modifiers: Several factors can affect a character's Leadership score, causing it to vary from the base score (character level + Cha modifier). A character's reputation (from the point of view of the cohort or follower he is trying to attract) raises or lowers his Leadership score:
Other modifiers may apply when the character tries to attract a cohort:
Followers have different priorities from cohorts. When the character tries to attract a new follower, use any of the following modifiers that apply.
Leadership Score: A character's base Leadership score equals his level plus any Charisma modifier. In order to take into account negative Charisma modifiers, this table allows for very low Leadership scores, but the character must still be 6th level or higher in order to gain the Leadership feat. Outside factors can affect a character's Leadership score, as detailed above.
Cohort Level: The character can attract a cohort of up to this level. Regardless of a character's Leadership score, he can only recruit a cohort who is two or more levels lower than himself. The cohort should be equipped with gear appropriate for its level. A character can try to attract a cohort of a particular race, class, and alignment. The cohort's alignment may not be opposed to the leader's alignment on either the law-vs-chaos or good-vs-evil axis, and the leader takes a Leadership penalty if he recruits a cohort of an alignment different from his own.
Cohorts earn XP as follows:
The cohort does not count as a party member when determining the party's XP.
Divide the cohort's level by the level of the PC with whom he or she is associated (the character with the Leadership feat who attracted the cohort).
Multiply this result by the total XP awarded to the PC and add that number of experience points to the cohort's total.
If a cohort gains enough XP to bring it to a level one lower than the associated PC's character level, the cohort does not gain the new level-its new XP total is 1 less than the amount needed attain the next level.
Number of Followers by Level: The character can lead up to the indicated number of characters of each level. Followers are similar to cohorts, except they're generally low-level NPCs. Because they're generally five or more levels behind the character they follow, they're rarely effective in combat.
Followers don't earn experience and thus don't gain levels. However, when a character with Leadership attains a new level, the player consults the table above to determine if she has acquired more followers, some of which may be higher level than the existing followers. (You don't consult the table to see if your cohort gains levels, however, because cohorts earn experience on their own.)
Source: SRD 3.5 Feats