Elisho's Absolute Dispel:

This spells DC can not be increased by any means. If successful, contesting magic checks are made between the two affected characters. If successful once again, the target spell fails, the target suffers a magical malfunction, and the target cannot recast that spell within the same session. If the caster agrees to suffer a magical malfunction at the end of the contested check, the target suffers disadvantage on all contestment checks involving this spell. The caster gains a +4 to their contestment check and rolls as if their magic is equal to the targets if it is higher. If the Initial cost of this spell is less than half the Initial Cost of the spell it is countering, rounded up, increase it to that amount.