Minerals of the Abyss

Having been told about the Ascension Keys, Deaderah will tell the party that one such key cannot normally be used in combat. To be able to use an ascension key, a wielder must attune to it. This is a difficult task that can realistically only be achieved by using an agent to assist with the attuning process. One such agent is a rare crystal known as Voidprism. It grows in places where the abyss interacts with other planes. Fortunately, a big part of the Mausolea region of Asmodeus is surrounded by the abyss, so the crystals are pretty common here. The adventurers will be asked to search around the edge of the province to find some voidprism.
Usually, the crystal grows along the cliff face that reached down into the void. It is unlikely to find voidprism along the top of the cliff, but there is a very small chance that it can be found here. As such, Deaderah informs the players of a pathway over at the west side of the region that decants slightly into the abyss. The demoness will follow up on this, saying there used to be multiple such pathways, a few of them starting in the city. However, the abyss has been engulfing more of the cliff, laying higher than ever and making these pathways inaccessible. The one far west of Mausolea, near the Impish Geyser, is the only path that Deaderah still expects to be accessible.
At this point, Deaderah will make an additional request to the players. She is skeptical that the expansion of the abyss is happening without cause. Therefore, she will offer the players a reward if they can find something remarkable or noteworthy related to the phenomena. The city keeper cannot give a clear answer to what kind of reward she’ll give, but she’s confident there must be something of worth laying around in the city’s treasury.
The party will be able to find the passage Deaderah spoke of by heading east past the Creepvine Plateau, crossing the magma river, and then heading south to the abyss. This road will cause the Imp Swarm event to trigger when the party gets close to Imp Geyser. Afterward, they will arrive at the passageway without issue.
Once there, the players will be descending, snaking around the cliff right next to the abyss. The players will have to try and locate the voidprism. They can make a number of rolls to do so (they’ll have to argue which skill they believe is fitting for this). Failing these rolls will not mean they can’t find the crystal, it will just take longer for them to do so. The longer it takes, the higher the chance they will be attacked by a void creature that is lurking around the passage. This aberration is a large Void angel. The players may be able to spot it as they move down. Studying or at least being able to describe this creature will be important for completing the optional objective given to them by Deaderah.
After having found the voidprism the party may return back to Mausolea and report to Deaderah. If they already possess the Ascension Key obtained from the quest The Key to Ascension, then they can perform the attunement ritual. Additionally, reporting on the ... will cause Deaderah to ponder a moment in silence. She will call the optional objective satisfied and hand the players a set of Bound Shrine Trinkets, one for each player. This will also trigger Deaderah to give the players the quest Beacon of Nentruhn the next time the party speaks to her.

Grander Scope

This quest allows the party to unlock the abilities of the ascension key they obtained.  Additionally, it provides information on the abyss and Asmodeus' position along it. This also shows some of the struggles that the demons of this realm have been dealing with for centuries. Most importantly, this quest serves as a way to unlock the quest Beacon of Nentruhn, which is its own side story.

Description

"To fully utilize an ascension key, a ritual is required to attune to it. For this ritual, a rare piece of crystal is necessary, one that only grows on the edge of the void. Unfortunately, the more common places where it can be found have been consumed by the abyss. This strange phenomenon has left only one place left that has a good chance of housing this voidprism. Travel to the east of Mausolea, past the magma river, and head to the edge of the world, there should be a pathway into the abyss. And when you're there, keep an eye out for anything noteworthy."
~ Deaderah

Progression

1. Obtain the potential location of the voidprism from Deaderah
2. Either scout the edges of Asmodeus for the crystal or travel east
3. Cross the bridge near Imp Geyser and pass the Imp Swarm event
4. Enter the passage
5. Find the voidprism
6. (optional Defeat or study/observer the void angel
7. Report back to Deaderah

Minerals of the Abyss
Quest Giver	Deaderah
Recommended Level	?
Duration	1 session
Reward	Voidprism, 6 Bound Shrine Trinkets