Elemental triangle

Casting this spell will create a triangle around you. The 3 corners in the triangle will be empty when first cast, but if you cast three elemental spells (Fire, Ice, lighning, etc) each element will be put in a different corner (Max 3). After you have used 3 elemental spells, you can cast Elemental triangle again, and it will fire a ball that is a combination of the 3 elements. The spell only lasts 5 rounds so you have exactly enough time to do everything.

Time: Cast +1, Element 1 +1, Element 2 +1, Element 3 +1, Cast +1 =5 rounds.

So you do not have time to heal or use any other spell during that time, or you will have to cast Elemental triangle again.