The Golden Chamber is an Event in Ruins of Corvus in Act V which begin when you pass through 1 of 3 door way with purple aura & it ask you to investigat a closed door in this square chamber you just entered.After you approach that door A series of unique purple monsters will be summoned in a specific order & you will be asked to defeat them so the door open & then you will be tasked with opening the resplendent chest in the treasure room the order of the monsters you have to defeat is as follows:
1-Pyresh, Guardian of Fire
2-Arcuss, Guardian of Ice
3-Miasma (Monster), Guardian of Pestilence
4-Wahr, Guardian of Strength
5-Troven, Treasure Guardian