Archmage Vargoth's Retreat (quest)

Objectives
Investigate Archmage Vargoth's quarters.
 * Portal Used
 * Archmage Vargoth's Retreat Entered
 * Archmage Vargoth's Journal
 * Crystal Ball Examined
 * Frosted Doughnut Examined
 * Magical Tome Examined
 * Well-worn Scroll Examined

Description
Archmage Vargoth has been absent for a while. You may have a look around his living quarters here in the citadel tower,. Kalec will escort you there.

I will hold out hope that our esteemed colleague is merely up to his usual eccentricities.

Rewards
You will receive:
 * 7,740 XP
 * 7,740 XP

Progress
What have you discovered, ?

Completion
Hmm. This appears to be Archmage Vargoth's notes on the Nightborne Soulstone. Supposedly the energy of captured souls stored within it can be channeled directly from the stone! If that's true, it is very powerful, indeed!