The chest is in the room with the Reanimated Hand (swim up through the water) at ( -61, -35, -278 ) /waypoint -61, -35, -278 most of the time, but can be in Hoptor's room.
Watch the DOTS from the froglok knights.
Past the first name, almost all mobs have constant knockback. Try to put your back to a wall.
There are traps which look like root nodes in this dungeon. Disarm them from maximum range or they punt you upwards and often pull additional groups. Note that the disarm is temporary: the traps will reset themselves.
This is a persistent instance, however if you don't do certain things before you leave you cannot progress when you return. If you get the key and don't use it to go downstairs, you lose it. If you don't click the orb to open the door after the minotaur, the blocks stop moving and you cannot get up there.
This minotaur, located at ( -104, -16, -115 ) /waypoint -104.46, -16.31, -115.35, hits harder than Krell, and has a mean AOE. He also has a curable stifle and an irresistible, uncurable stifle.
He drops a ghoulish key that's needed to open the side gate ( -125, -22, -85 ) /waypoint -125, -22, -85. He must con at least green (you can be no higher than level 94) because the key is in his chest, not a body-drop.
Go to the locked gate at ( -143, -22, -127 ) /waypoint -142.71, -22.17, -126.51. Jump on the nearest moving stone then keep jumping on higher moving stones. Jump on to the building . Now jump on the fourth moving stone to jump on the next building. Click the Orb to open the second gate. (If you are on the quest Final Warning, pick up page 5 while you are on the first building).
Gorscha is located at ( -206, -12, -219 ) /waypoint -206, -12, -219. He likes to Fear the tank and then switch herself onto a healer. He also memwipes, and can stifle.
Fight him in the room, in a corner near the ramp.
The best bet is to heal and DPS through the named, and burn the named down as hard as you possibly can.
Furdip is located at ( -238, -19, -284 ) /waypoint -238, -19, -284.
He warps around the room at random and aggros people randomly during the fight.
Furdip is also invulnerable. Someone other than the tank or healer needs to harvest a glob of congealed mess from the blood fountain in the center (click the bubbling areas), and put it on your hotbar. When Furdip says "Rest, rest and then your death!" use the congealed mess on him to make him vulnerable for ten seconds. DPS hard during this time.
Rinse and repeat the harvest/click/10 seconds of DPS.
Open the door by clicking the totem at ( -145, -21, -213 ) /waypoint -145, -21, -213. You climb up a broken beam to get here.
The King is located at ( -144, -40, -362 ) /waypoint -144, -40, -362, up some steps at the far side of the shallow pool. He is a high-DPS fight with a number of vicious, disease-based attacks, which need to be cured quickly if possible.