Leader

✦     A subrole that can be combined with other roles (a soldier leader or a solo controller leader, for instance)
✦     Grants its allies bonuses to attack rolls, damage rolls, defenses, or other statistics
✦     Sometimes allows its allies to heal

Tip: Use a leader to reinforce a particular theme (such as confronting an evil cleric).

Published in Monster Manual, Rules Compendium, page(s) 286.