We wanted to give notice that the new level 80 single player instance 'The Slaughterhouse Cellar' located in Thunder River will cause issues if you enter the instance with more than one player. It's a single player instance but currently more than one player can enter together. This is not intended and it will be addressed as soon as possible (next week). The reset time on the instance is also set longer than what was intended and this will also be addressed early next week as well.

The instance was designed for solo players and if players currently enter together with others, those who are collecting the shards will not be able to complete the quest for the instance as there won't be enough shards to loot.