Mind hunt is a ritual spell - very cheap at 2 astral pearls.
Requires soul slay or mind burn to also be researched. Can be resisted, but the enemy often has penetration boosters such as the eye of the void cutting into your protection. If you have a super combatant pretender and zero mr boosters, it can help to retreat to your highest dominion province, and include a few high MR mages/cheap indie priests to draw fire as well.