The Onyx mirror sometimes show up at a player, the player can then "touch mirror" to enter it.
The mirror contains a couple of distinct areas:
- tunnels (with Time Lord and Time Warrior)
- Village with a tavern, and Jhordie Aeln
- Tundra
I believe there is also a Rune Castle here...
Upper area and Tundra:
All south over the bridge, there is a tomb
- open tomb, and there is a message
- open tomb again, and you get attacked by wraith lord
- Scroll of Soothing