By the way, do not underestimate the range of their attacks, especially Mr. 
's attacks. I would say his 1/1+Poison attack has about 400~500 range, his arrow rain attack also has a huge vertical range and it will seal you (if you dont lure him away, he'll keep sealing the Mage Grandmaster attackers on top of the map every 5 seconds).
Also I don't know if Paladins with Lightning Charge + ACB are good damage here. Afaik the 3 other grandmasters are not lightning resistant.
But for NL's, BM's, MM's, CS's, AM's I wouldn't know any attack strategy for the 3 low Grandmasters for them, other then hoping you survive the stuns, seals, and 1/1+Poison and other ranged attacks...
Ranged attackers should just focus on the Mage Grandmaster I guess.
's attacks. I would say his 1/1+Poison attack has about 400~500 range, his arrow rain attack also has a huge vertical range and it will seal you (if you dont lure him away, he'll keep sealing the Mage Grandmaster attackers on top of the map every 5 seconds).Also I don't know if Paladins with Lightning Charge + ACB are good damage here. Afaik the 3 other grandmasters are not lightning resistant.
But for NL's, BM's, MM's, CS's, AM's I wouldn't know any attack strategy for the 3 low Grandmasters for them, other then hoping you survive the stuns, seals, and 1/1+Poison and other ranged attacks...
Ranged attackers should just focus on the Mage Grandmaster I guess.