The Cursed Chamber of Bone
From Diablo Wiki
The Cursed Chamber of Bone is a Cursed Event that appears on level one of the Cathedral in Act I. It can appear in Campaign mode and in Adventure mode both as a Cursed Event on its own or as a Bounty.
When you click on the Cursed shrine the event begins. You must defeat five waves of enemies before the timer expires. If you do so you will be rewarded with a bonus chest and the shrine will turn into a random shrine effect. You will get only the shrine if you fail to kill all five waves of enemies.
As the first small wave of enemies appears another bunch of skeletons can also appear from the north, they are nothing to do with the event so don't be distracted by them as the timer is very very short. Only the enemies that spawn with yellow circles under their feet are from the cursed shrine and count towards the five waves.
The Cursed Chamber of Bone is in some way involved in the following achievement(s).
[[Category:Achievements () |]]
|Quests & Events of Diablo III  Act I Act II Act III & Act IV Act V|
|Act II Quests||Act II Events |
|Quests Act III||Events Act III||Quests Act IV |