Several Bugs in The Phaaryl Megalith Bossfight

Bug ID. 746.819.603

There were several visibility bugs in the bossfights. Parts of the Bosses and their attacks were still visible after theses bosses were defeated.
- Draven boss left some of the "green waves" attack. Though it didn't cause any damage when walking over it.
- The Devourer left some of his serpentine back on the ground

The Crowbell boss spawned in the middle of the arena but did not engage the fight. He stood still and could not be damaged by attacks except the default crossbow attack.