To get access to the Purgatory the main story missions of Mystras need to be completed up to and including "The revival of the Sanctuary".
The instance is available every day for 6 hours and consist of three locations with door fights and a boss location.
If you clear the location before starting the door fight, there will be less monsters to fight at once.
The monsters in the instance adapt their strength to the opponents level, this includes mounts or summons if they are summoned too early in the fight.
To remove the Rotten Bite you will need Scrolls of Antidote. It's recommended to remove them when 2-4 have been stacked up on you.
You can use Fury of the Panther or Fury of the Tiger superblows to get rid of the Lacerations.
Allows him to restore 30% of his life, but can be removed with Scrolls of Purification or the bow skill Corruption.
Will reduce the players damage by 5% until the end of the fight and it stacks. Can be removed with Fury of the Panther or Fury of the Tiger superblows
He will kill opponents below 30% of their maximum health instantly. There is no counter, thus you should ensure to remain above 30% health.
For killing the boss you will receive:
money that is depending on player level (starting at around 1g50 for level 5 it can go up to 15-30g for level 20)
1 Shard of the Crystal (7 Shards can be combined in the Collections tab to get a Full Crystal, which can be exchanged for 25 Residents Mystras Reputation as well as 5 Djinnar.)
1 Stone of teleportation (needed to teleport to Sanctuary)