Thanks for this, and sorry it took a clarification to find it. The full-size Balrog in Balrog's Tomb had never been added to our game: there were no Balrog monsters, and Mu Young was just a plain warp. It's in now, live, working as it does in v83. Talk to Mu Young at the Cursed Temple (level 50+) and form an expedition of 6 to 30 players as a party. The leader starts it and everyone warps in. The sealed Balrog body and its two claws are waiting. The left claw breaks free after a minute. Take down both claws and the body can be hurt. Kill it and the whole server hears about it, and the sealed Balrog appears 10 seconds later. The run lasts an hour. The Mu Young inside the tomb takes you out, or to the clear map once you've won. We'd love a 6-person test run if you can gather one. (The smaller Jr. Balrog in the Cursed Sanctuary keeps its authentic 3-hour respawn.)