Hey, the altars spawn in the same room as a mini boss does. They show up by luck, you’ll have to run a lot of times, or only a few.. depends. I think they show up the most in 4-5-6, you’re doing nothing wrong. Just takes some time.
This is the link of the video Runagain made,
https://youtu.be/Y9Ay07C0c_w
Here he’ll shows you the way the altar looks like: at 1min 35 seconds.
I hope I could help you a bit. Runagain’s forum account got banned unfortunally, he’s yet in game.
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