The Contorted Realm (Peaks of Time 15) is kinda very confusing for most players on the first try. It contains plenty of collapsing bridges and teleports. Kindly follow the map below to get all of the reward chests!
You want to connect different pieces of the map using those helpers to access the entire map.
The crystal chests are blocked by high-leveled enemies so you want a decent power to defeat them. I can barely defeat them with the lvl. 220 ascended team.
The bright side is you can collect most of the gold chests with ease. Since you have passed all of the other previous Peaks of Time stages, you can get all of 34 gold chest with almost zero effort.
The Contorted Realm Map Guide