Damping Sphere

A fist-sized orb of smooth metal, interlaced with arcane marks and geometric glyphs. As an action while holding the sphere, you can speak a command word to activate it, causing the sphere to absorb all magical energy in a 30-foot radius surrounding the sphere. At the start of your next turn after activating the sphere, this radius increases to 60 feet. Any spellcaster in the radius which casts a spell must use a spell slot of one level higher; doing so does not change the effect of the spell if it would normally do so. Cantrips can be cast as normal. Spells cast within the radius of the sphere’s effect cannot be cast at a higher level than their base level. Whenever a creature in the radius of the sphere’s effect casts a spell without using spell slots, such as with innate spellcasting or using a magic item, roll a d20. On a result of 11 or higher, the spell is cast as normal; otherwise, the spell fails.