Currently, the only useful locations for Void Creatures are found in pay gated regions, unlike a majority of "defeat/destroy X enemy" endeavors who tend to have base game options.
As it stands, the only base game option for Void Creatures is Voidmother Elgroalif through Infinite Archive. She appears in one of the Cycles, in a pool of dozens of bosses. Good luck relying on that, you could be there for hours. Also fun fact, voidmothers that spawn due to the Writhing Wall invasions in Delves/Public Dungeons don't count.
Thus, my request to you, Zenimax, is to tweak Dro-m'Athra type enemies so that they count as Void Creatures. It makes sense, lore wise, as both Voidmothers/Shades and Dro-m'Athra are related to Namira/Namiira. There is also a voice line spoken by random Dro-m'Athra enemies in the Maw of Lorkhaj:
"Behold, the power of the void!"
Rakkhat, the fang of Lorkhaj, also has many lines referencing the void and Namiira.
This also opens up some extra options for base game players and DLC players alike, as Dro-m'Athra can be found in the Sathram Plantation in Stonefalls or in the Infinite Archive through Zhaj'hassa, Rakkhat or through stages where Dro-m'Athra are one of the regular enemy types that can spawn. This also opens up the use of the Maw of Lorkhaj itself from the Thieves Guild DLC as a possible option for this endeavor. 
            
         
                
                
                
            After the disaster of the Writhing Wall, I decided to pick up New World and got to play it for two weeks. Those were some of the most fun weeks I’ve had since One Tamriel brought us all together.
A few highlights of my experience over there, that I would love to see introduced in some capacity in ESO would be…
A complete overhaul to how music is played in ESO, instead of an emote, can we make use of the Bard’s College in Solitude? In New World you collect different instruments with unique perks, and find songs that you can play on a whim, and when you do play them, it’s like playing Guitar Hero. I found that to be incredibly fun.
A complete overhaul to how factions are handled in ESO’s overland, instead of being meaningless outside of Cyrodiil or Imperial City, why not introduce a flagging PvP system and new forts in every zone that factions can war over? This did not impact my PvE experience whatsoever as I quested my way to level 70, yet gave so much depth to the experience at endgame.
A complete overhaul to how Battlegrounds work, right now it’s 4v4 or 8v8 with no definitive modes to queue into, in New World you have 3v3 matchmade Elimination with Role-Based queues (can’t have more than 1 support / can have 3 damage dealers) 20v20 Capture the Flag and 50v50 Outpost Rush… we could use the assets already available in Cyrodiil to create this experience.
ESO is a great game, and there were so many lessons that New World could have learned from the many successes ZOS have accomplished much earlier into it’s life cycle, but now that it’s reaching End-of-Service my hope is that we could take the best parts of that dying game and bring them home.