This guy is tough. We finally killed him today after the 8th attempt. 111 DRU, 111 NEC, 111 ENC, WAR merc and two CLR mercs. With two CLR Mercs and a Druid, it seems we still didn't have enough healing. He kept taking us all down to half health. The blinding is only a mild inconvenience. He attacked and killed the Chanter twice. At 1% health, the WAR merc died and the NEC pet finished him off.
He was hitting the WAR merc for a max of 34K, and the Druid for a max of 47K. It's really the crippling strike you need to worry about. It hit the ENC for a max 79K and the NEC for a max of 66K
Eat your Wheaties before attempting this guy. Parser says he has 37.5 Million HP.
He dropped Overklerk and an Enchanted Dragon Scale power source. Glad to get him checked off our list.