Welp, I know the location of three of the 4 relics.

One on a platform raised above a shallow pool in a wide open room (have to use noclip or spawn boxes to get to it),

one resting in a pool of water in a still fountain, midway up a stairwell in the more old timey corridors, the stairwell having a view out through a window.

And the last I know of being on that big cluster of blocks with a tree at the top, with a void around it. should be able to see it while walking around the walkway around it.

As for where they go? Head back to spawn, and pass through the triangular tunnel, looking for a side passage. Looks like a teleporter frame of some kind.

Someone know where the last relic is?