DISCLAIMER: Your Steps and Tasks may be different
1) Speak with Mardelen at loc=23711,23514 Abandoned Mines.
2) Kill the tenebrae in and around loc=21442,22256 Abandoned Mines, down the ramp from Mardelen, until the Arawn Blessed Jar is full.
3) Return to Mardelen and hand him the Pulsing Arawn Blessed Jar for your reward.
lvl 22 received 1,115,000 experience and 17 silver.
Dialog from quest:
Speak with Mardelen at loc=23711,23514,17634 dir=336 Abandoned Mines.
Mardelen says, "I am sure by now you are aware of the Tenebrae. They have been a mystery to us for some time. We have yet to come up with a defense against their [attacks]."
Mardelen says, "Greetings young Friar. I have a task for you if you are willing to [listen]."
Mardelen says, "There magical abilities seem to be drawn from the shadow itself. We need to research their origins. To that end, will you help us gather their essence?"
Will you capture the essence of the tenebrae? [Level 20-23]
You have been given the Shadow Soul quest.
Mardelen says, "Here, take this jar. It has been blessed by Arawn. Search out the tenebrae. There is a chance that the jar will capture the essence of any tenebrae, but there are certain ones I know of. They include the tenebrous soldiers, creators, reavers, and channelers. When you defeat them, there is a chance that the jar may capture their essence. Return to me when you have filled the jar."
You receive the Arawn Blessed Jar from Mardelen!
[Step #1] Hunt tenebrous soldier, creator, prelate, reaver, or channeler, among other tenebrae until you capture an essence. They can be found down the northwest tunnel at the bottom of the chasm.
The Blessed Jar begins to faintly glow.
[Step #2] Finish filling the jar with the essence of a tenebrous soldier, creator, prelate, reaver, or channeler, among others. There is no need to do anything with the jar. It will capture the essences itself.
The Blessed Jar begins pulsing with an inky darkness.
[Step #3] Return to Mardelen down in the chasm.
Mardelen says, "You have returned. Hand me the jar please."
Mardelen says, "Very good. Now we might be able to find an effective defense against the tenebrae. Here, take this in payment for your services."
You are awarded 1,115,000 experience!
You are awarded 17 silver and some copper!
You have completed the Shadow Soul quest!