Formed long ago from the lush foliage of the Wailing Caverns, the massive elemental Verdan the Everliving was once the Caverns’ guardian. Corrupted by Naralex’s nightmare, the once gentle giant is now an enormous abomination that will crush any living creature that ventures too close to his lair.
Verdan is by far the toughest fight you'll encounter in Wailing Caverns. He has a huge hitpoint pool, and he hits between 200-300 with each attack.
The tactic could be kite he or just let warrior to tank him,with healers constantly heal the tank.