Ring of fire (Acrylia Caverns)

Finding and triggering the Ring of Fire
In Acrylia Caverns, as you enter from Grimling forest, head west and follow the tunnel to into a cavern. At the end you'll find a ring of torches. Once you step into this ring a spawn cycle starts which gets progressively harder as the spawns progress.

When a person enters the ring, a number of untargetable, unnamed Grimlings will appear around the room, and a Grimling Warder will appear in the hallway to the room. None of these Grimlings can be targetted or attacked.

The purpose of the Grimling Warder is stop being from entering or exiting the room. If you try to pass the warder when he is up, he will port you to a pit of Lava in the Dungeon. Your entire raid force needs to be in the room from the start to the finish.

The grimlings will summon undead type monsters on a progressing level of difficulty. Every 20 Minutes, a boss monster will appear, and then the quest will get more difficult than the ring before.

If your party or raiding force leaves the ring, the quest will reset, ending spawns and making you start again at the beginning.

Waves
The first three waves can be done by a group for XP. It's reccommended to have a raiding party handy to go past the 4th boss.
 * The first wave is two (warrior) possessed corpses every 2 Minutes. Then a possessed battlelord will appear as the boss.
 * The second wave is two (warrior/shadowknight) possessed corpses every 1.5 Minutes. A possessed battlemaster will mark the next round.
 * The third wave is two (warrior/shadowknight) possessed corpses every 1 minute. A Possessed Warmonger is the boss.
 * The 4th wave is three possessed corpses every minute, A Possessed Warlord is the boss, who can drop significant loot. He flurries and has quite a few more HP than the previous bosses.
 * The 5th wave has level 55 possessed corpses which cannot be mesmerized or stunned. Two to three of them will appear every 45 to 60 seconds.

Loot

 * Aggression
 * Armband of Serenity
 * Axe of the Warmaster
 * Bone Bladed Scimitar
 * Bone Collar of the Possessed
 * Boneweave, Bracer of the Enslaved
 * Crown of the Undead Warmaster
 * Earring of Death
 * Earring of Fond Memories
 * Eye of Possession
 * Feather Lined Bag
 * Feather Lined Box
 * Fungus Covered Vial
 * Gauntlet of the Fire Ring
 * Gauntlets of the Cleansed Circle
 * Gem Encrusted Choker
 * Grimling Bone Bow
 * Icy Greatstaff
 * Mindstealer
 * Preserved Bone Talons
 * Robe of the Enslaved Soul
 * Seer's Orb of Power
 * Sharpened Vah Shir Femur
 * Sinew Sash
 * Skull Charm of the Oracle
 * Spear of Eternal Bondage
 * Totem of the Corpsemaster
 * Vile Rib of War
 * Warmaster's Mask of Battle
 * Warmaster's Ribcage
 * Wraithlure