You could use units that are immune to mind spells to prevent hypnosis.
To prevent him from resurrecting dead stacks either put your own units on top of them, maneuver him to move his own living units on top of them (best, since when that dies you only need to block 1 spot for 2) or use the rage wall or rage ice crystals to block off the dead stacks.
For attacking the crystal, use something with no retaliation like royal snakes, or black dragons as their immune to the crystal's retaliation.
Using those strategies, you can knock out the enemy troops and block them off, and then sit and whittle down the crystal at your leisure.
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