Becks is a bit buggy, he tends to walk to the door and hug it, if he is left alone too long he will regenerate health. Try to keep him in the middle of the room to prevent this.

On the right side of Becks there is a big bell that you can interact with. If you use it, that person will be transported to a room with a couple of normal monsters, kill those and Becks will take triple damage. (need verification on this) It is not necessary to use this though.

After defeating Becks, the doors open and you can move up the staircase. And Becks has 253,045 HP

Pooch & Tack

The second boss are guardian dogs named Pooch and Tack.
They can be pulled seperatly increasing your chance of survival. Though they are not incredible powerfull they can still pack a punch without The Chronicles of Spellborn Gold heals or buffs. If you do pull both at the same time, split up your party and fight them. A good solution is to have a warrior solo one, using tcos gold Disarm as much as possible to reduce damage taken.

Pooch uses normal melee hits, nothing really worth mentioning but they can hurt. Tack does the same except he can teleport you away from him. It does no damage but it disorients you. Tack seems to have less resistance then Pooch, and dies faster. So far, it seems that Pooch has a higher chance of dropping the APP necklace (best drop in this instance). However it has been said that any mob in the instance can drop it.

After disposing the guardian dogs, move up the staircase The Chronicles of Spellborn Gold again and into the final room. Before entering its a good idea to discuss the tactics for Amsell.

Both dogs have 54,293 HP

Amsell

Amsell is in a big room, really nice looking place. Around him in the corners of the room are four crystals. As soon as Amsell starts his conversation, his minions will spawn. Destroy the crystals and the summoning will stop. Now kill the minions as fast as possible and The Chronicles of Spellborn Gold  make sure that you stay out of range of Amsell. Do not destroy the crystals if he has not started his conversation/summoning. This will cause him to keep summoning to no end and you will be overrun with angry little fat ugly minions!