DOS2:The Purged Dragon

The Purged Dragon is a quest in Divinity: Original Sin II. This quest is initiated upon interacting with Slane, the winter dragon.

Objectives

Free the Winter Dragon.
Alone on the sand, Slane the Winter Dragon was rotting in chains.

Heal the freed Winter Dragon.
The witch Radeka purged Slane. Her Purging Wand may free him. Slane is now free, but he still seems unwell.

Speak with Slane the Winter Dragon.
We gave Radeka's Purging Wand to Slane, and he transformed into a lizard.

Walkthrough

Once you interact with Slane at   X: 578  Y: 160  , you will find that he cannot talk to you until you break the chains or totems. Break the two totems and talk to Slane. He will reveal that he needs Radeka's Purging Wand as she used it to steal his source and capture him. To obtain the wand, go to the 'Hollow Marshes - Dragon's Beach' waypoint found at   X: 582  Y: 103   and enter the skull-looking cavern at   X: 588  Y: 96  .

Inside the cavern, Radeka can be found harvesting blood roses. By either stealing it from her body or upon initiating combat, Radeka's Thorn can be looted off of her body.

Note: If fighting Radeka, be prepared for her to summon various beetles and undead enemies.

Return Radeka's Thorn to Slane for 2100 xp or keep it for yourself, which will initiate combat. If you defeat him, you will recieve 6000 xp and retain Radeka's Thorn.

For maximum exp gain, return the purging wand to Slane, granting 2100 xp, and before ending dialogue, have another party member attack Slane 3 times and then end the dialogue. This will start the combat right after he takes Radeka's thorn, and defeating him will grant you that 6000 xp, for a total of 8100 xp. You will lose out on the purging wand with this option.

If Slane is kept alive, he will help you purge the shriekers in front of the entryway to the final Alexander fight of Act One.