Dweomercraft (Su)
Source: Advanced Player's Guide, p. 82
A magician can use performance to manipulate magical energies. Allies of the magician gain a +1 bonus on caster level checks, concentration checks, and attack rolls with spells and spell-like abilities. This bonus increases by +1 at 5th level and every six levels thereafter.
This ability relies on visual and audible components. It replaces inspire courage.