multitasking

when a spell caster takes this ability the spell caster may cast a cantrip along with one spell of any level. At 12th level the spell caster can cast an extra spell thats is 2 spell levels lower than their highest spell level
E.G. if the spell caster's highest level spell is 7th level the spell caster can cast a extra spell of level 5 (at highest).
at level 18 the spell caster can cast another extra spell of 3rd level or lower.

this feat allows for a extra attack for other classes such as monk or fighter. at 15th level for these classes they gain an extra 2 attacks