Haldi's Oasis is a hill, inverted in on itself. Haldi, born under the waning moon to the tribe of water, needed someplace to reside. This hill seemed right, and it is simply upside down now.
Haldi blessed Taki's shovel, thrusting it deep into the ground as the earth was butter, pulling it back up just before the handle sunk in. Only once may they thrust it into reality and open a gate to Haldi's Oasis. The door will not stay open for long.
Haldi also blessed Wysteria. For a moment, she was one with the land around her, sensing nature the same way the dryad does: as part of it. The dryad appears to the party in their physical manifestation, but they are much more: they are the land, and the land is the dryad. She focuses Wysteria's attention underground, where the roots criss-cross through the soil. She is granted a targeted entangle spell.
Quack performs a stunning acrobatics show for the party, granting advantage to the next dexterity saving throw each of them makes.
The party's dream is of a green glowing aura that touches all, all being connected by it. This is the key, that which is bringing them all together, what kept them inside of the ethereal realm, their connection. The source is unknown, its function totally alien, but soon they see something else. In the distance, the adventurers can see an urn sitting on a shelf, each knowing that it is the one connected to each of them, one connected to an entire mass of people. It is not one that is charging, but rather one that is now fading. This urn was collecting energy for a different purpose, now lying vacant, dormant, and useless, but still existing. It is what is causing the party to feel what the senses they shouldn't be able to sense. A new view appears in this dream realm, the cabin, so many green tentacles leading to it cabin, so many trapped there, like they were. They are still there. Above the urn, a humanoid form hovers, wrapped in bandage, a hood over head slowly dragged back as it begins to cast its nightly spells, defensive, warding, scrying spells: the Lord Of Worms, not seeing them in the slightest, the party granted a window into his world: not enough to know what he’s doing, but can sense that this creature is the origin of the urns, one who has plans for them. He likely had a hand in their design.
Upon further insight from the party's resident necromancer, Taki, the party gleans further information: the urns are definitely necromantic in origin. There is also inconsistency in their design. The design, the idea, whatever created these things, was not started by the Lord of Worms. They have obviously taken someone else’s magic, their idea, and modified it. Glimpsing the weave around the urn, they see what looks like a child’s drawing forced to work this way. It is clear that this is not the urns’ original purpose, their purpose tainted by the Lord of Worms.