Ring of the Law
From WoWWiki
The Ring of the Law is located inside Blackrock Depths. It is accessed through the Halls of the Law just beyond the Detention Block.
When a player stands on the mesh circle at the center of this area, it starts a plot event. The entrance to the ring is closed, and High Justice Grimstone appears in the ring. This dark iron dwarf is flagged red, but cannot be attacked; his purpose is to explain what is about to happen.
He releases three waves of non-elite monsters, and then an elite mini-boss. The type of monsters and specific mini-boss which appear vary randomly between several alternatives. Monsters: varies. Bats, scorpions, worms, and slimes are all possible. Mini-Bosses: Anub'shiah, Eviscerator, Gorosh the Dervish, Grizzle, Hedrum the Creeper, or Ok'thor the Breaker.
Once the players are victorious in the ring, the ring's entrance reopens, and a second gate also opens, leading to the ring's upper levels and the rest of the instance. The arena spectators on the upper level are normally hostile, but become neutral when the ring event is won.
The Ring of the Law event can be bypassed via the west garrison side door, which can be opened with the Shadowforge Key or by lockpicking (skill 250) or its alternatives.
The stairs leading up through the opened gate leads to the East Garrison, West Garrison, and the Shrine of Thaurissan.
Alternate Ring of the Law battle (0.5 upgrade quest chain)
This is the Dungeon 2 set upgrade task to kill Theldren's Army and retrieve the Top Piece of Lord Valthalak's Amulet. To do this, just go in the arena, use the banner while the dwarf is "sentencing" you, and destroy all the mobs that come out of the gates. NOTE: Do not forget to get the Top Piece of Lord Valthalak's Amulet from Theldren.
These mobs behave like a pvp group with a mage, healer, warrior, rogue, and sometimes a dynamite tossing goblin. Can't taunt them so they go for healers. Not too hard if done with a mage. Every enemy who fights with theldren is immune to a warrior's taunt, so crowd control is a must.
The completion of the event spawns a box of loot and you get to keep the banner in case you want to get the loot again in the future.
Loot of note
If Theldren is killed, an Arena Spoils chest appears. Rare loot includes:
