You can unite two spells together.
Prerequisite: Caster level 5th
Benefit: You can join two spells that can be cast in a single action and can have the same legal target to form a single effect. All variable effects of the spell are based on the higher level spell. A merged spell uses up a spell slot two levels higher than the highest level spell’s actual level and uses up the same slot as the lower level spell’s actual level.