Arcane - Circle of Amplification

You touch a spot on the ground, creating a circle of runes with a radius of 15ft with the spot you touch being at the center.

For the spell's duration, the first time a creature casts a spell within the circle, the spell counts as being cast 1 level higher than the level of spell slot expended, provided the spell can be cast at higher levels. The creature must usually be able to cast the spells at the increased level, otherwise they cannot benefit from this effect.