Easiest way to do this is take 4 ruby dragons and any color for your healer. When you get to the boss dismount your healer and have them stand by the loot chest. Have the 4 other toons flying on ruby dragons on follow in healing range of your healer. Once you engage the boss just spam Attack and Evade buttons. Have your healer heal whoever needs healing. If you need to rotate aggro manually with the whatever that spell is that aggro's the boss. When the phase balls thing starts just fly around the circle so you end up by your healer again. Rinse and repeat until he dies. Don't worry about the whelps they will die from your ruby attack aoe.

Having ISboxer really helps this fight. With keyclone my alts would not follow me and the FTL DPS buttons from ISboxer activate the vehicle attacks.