Arcane Seal

Instead of casting this spell on its own, you cast it simultaneously with another spell, consuming spell slots for both and ignoring the rule against using more than one spell slot in a turn. That other spell is protected by the Arcane Seal. The protected spell can only be dispelled by a spell of 4th level or higher, including by spells that end the conditions inflicted by the spell, such as Remove Curse and Lesser Restoration. Arcane seal cannot be dispelled itself, only ending when the protected spell ends.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the level of spell required to dispel or end the conditions inflicted by the protected spell is equivalent to the level Arcane Seal was cast at.