You tank the boss away from the wine cask since it heal if you don't. And then the pally/mages attack the wine cask untill the summon Liqour Spirit spawns. Get him close to the boss and nuke him with single target spells and no aoe at all since it heals the boss if it hits. After some time the liqour spirit killed the boss since he does dmg to the boss if you nuke him.
Stage 2: DONT attack the wine cask and just tank and spank. You can energy bomb away the adds if they annoy you to much.
![](https://i.ytimg.com/vi/2jM8MQyiKfM/maxresdefault.jpg)