Some Strange Blue-pink Crystals In The Dwarven Lands

Through the hole visible at the bottom of the lake...

Is a cave full of more class.

There are no other exits I've found to the cave, though there is another crystal in a canyon (with a trail of glass panes leading from it to the lake) and a trail of glass panes which leads to another, different cave which I forgot to screenshot but has a lootchest and a weird crumbled-fortification sort of thing at the back (looked like there should be a hidden path from there but i couldn't find one).

 

Used to be an old relic spot

 

Just in case you didn’t know, relics were a thing before the d&d update. You searced for them and they would give you a reward, such as a powder, then go on cooldown so you can’t abuse them.

 

Technically, this is either in CotL or the Ahms region, depending on how you want to divide up the area. But as others have mentioned, this was an old relic spot.