Are they still spawning? I read up on them but can't figure out how to activate the room to make them spawn.
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Long story short:
1. Acquire 8 power cores either by using the method mentioned by
@Specialist or do it the easy way and go buy them from the vendor in the Moonglow Lycaeum. They are kinda expensive but for a one off to get a few energy drakes, it's worth it. You could spend a lifetime trying to get the cores from hidden boxes.
2. Do the lever puzzle in the far back room to remove the rocks in the right passage near the entrance. It's a bit trial and error as I remember and has the potential to one shot you.
3. Navigate the passage where the rocks were without dying. (I place a small stack of coins on the safe spots as I find them)
4. Place a power core in each of the chests around the power conduit thingumies. Once all are placed the event will activate in the open area at the far back room where the lever puzzle is.
You can recycle the drakes by killing them till you get the stats you want. Be aware that the event is time limited, that said it certainly lasts a good few hours before it deactivates so you have plenty of time to find a few good uns.
Hope that helps