Erkolo's Suppression Lattice

You impose a rigid suppressive lattice over the area.

When the lattice appears, any spell of 3rd level or lower currently active in the area immediately ends
The first time each turn a creature in the area attempts to cast a spell, it must succeed on a Constitution saving throw or the spell fails and the spell slot is expended.
Spells of 6th level or higher automatically succeed on this saving throw.

This spell does not affect magic items or non-spell magical effects.