Dark Invocation; 8th
You can produce a break enchantment effect (as the spell) with your touch. You can only attempt to affect any single magical effect—an ongoing spell, a permanent transformation, a magic item, or the like—once per 24-hour period.
In addition, you can use caster's lament to counterspell another caster's spell (of 7th level or lower) as if casting greater dispel magic.
Source: Complete Mage