It's a fantasy role-playing game.

DM: You are Vex Vex'ahlia, a half-elf ranger . You are the member of the famous group of adventurers. Previously, These stones are utilized, apparently, in both keeping the rift contained and keeping the city of Vesrah aloft and up towards the air.  However, in the process of them researching where these lodestones came from, it was discovering in recent years that they were byproducts of one of the krakens that lives in the Water Elemental Plane.
DM: It's ridiculous. So you guys all eventually dive into the water, and as you do, you look down and there is essentially a 40-foot-wide gap in the beach here, just barely submerged beach, that coasts down and drops off directly down into this cylindrical section that is just open. And as you drift down, your goggles visible, you can see around you, dry, pale reef that slowly gives way to colorful, life-teeming reef. You see hundreds of fish of different sizes and colors, all darting in and out of the various gaps and openings in the side, you see vibrant plant life beginning to massively jut out from the side of this reef. Further down, you see eels twisting through, and bits of kelp and other long, underwater plant life tickle your body as you push past and drift, keeping track of where you're slowly sinking down, desperately trying to follow this dwarf that is no longer in view, he just dove straight down and is far more comfortable under the water than most of you. Eventually, the reef begins to cluster in tighter and tighter, and you start getting a little nervous as to if you're going to hit a bottom or hit a pinch point. And then suddenly it stops, the reef just ends, and you now are floating down into what appears to be endless dark ocean. And just below, you see just a faint bit of light, and you start noticing the dark color is because you're about to hit an extremely dense forest of underwater plant life. You watch as all of these long, thin tendrils of almost vines covered in elongated leaves begin to curl up around you, and you start pushing through, following this light, and as you get across to the edge, Keyleth, you're the closest ahead and you guys have just enough light to watch the bead of where Keyleth is. Keyleth, you can still see Durent and keep that pace. He leads you down over this bank of where the top of this underwater forest ends, and you see, attached to the reef above by a single pillar of stonework that seems to be built or carved out of the reef, emerges a spiraling tower that eventually ends on the floor of the ocean here. It's made of a yellowish-white sandstone-like color, there are pillars carved out of it, naturalistic, but also have almost a series of bevelled edges to them. Within the inside, there is a dull green glow that is pulsating, and as Durent makes his way down toward one of the many openings in the floors, you can see there is a very, very faint sparkling energy that seems to just drift up out of the center of this tower. As you make it further down towards the base, you now begin to see through some of the openings, the center of this tower is hollow. It is an exterior, like a very thin Colosseum-like structure that goes up for multiple floors, slowly pincering as it gets to the top, and it is just an open interior inside. As eventually you touch down onto the soft bottom of the ocean here and begin making your way, slowly swimming towards the interior, you can see a number of other similarly dressed Waveriders as well as armored guardians that stand, all with various trident or spear-like weapons. A number of them appear to be of varying races, human, half-elf, elf, it appears that Durent is the only dwarf you see in this vicinity, and a couple of them appear to be merfolk, like straight-up half-human, half-fish, tails, fins, gills, the whole circumstance.
Player: What does their hair look like?
DM: You see two of them, one of which is male. No visible hair on him, actually, just the frill that goes down his head. The other is female. Long, deep, dark blue hair that drifts past, and as she shifts and looks in your direction, you watch it hold in place and slowly shift as the water currents push through.
Player: I just stare at her.
DM: As you're entranced by this, your attention slowly glides over to the very center, the base of this temple, where you can see there are these three large, smooth, gray-ish rocks that are embedded in the ground, about five feet wide, and in the center of these three rocks, you see what appears to be-- it's almost like an oval shape, about ten feet tall, about five feet wide, that is crackling blue energy. This opening, here. And you can watch as occasionally clouds of black, murky soot or sand, deep, deep ocean sand, push through. You can see, as you get closer and peer in, this is a doorway into the plane, this is the rift. Unlike the one that you saw at Pyrah, which seemed to flicker and have a barely contained energy when you've seen it at its torn-open stages, this appears to be fairly contained. It's demure, there's not a lot of movement, it's just stationary, and the guards that surround it in the center of this temple all look inward, keeping vigilant watch. As you follow Durent, making his way towards the doorway, you can see within each of these three large, half-buried stones, there is a smaller, deep emerald green, almost jade-looking stone that is about that large that is embedded in each of these. Durent points over to one of them, and you hear him, through the water, the throat bead carrying the sound of his voice through, "This is what you're looking for. This is a lodestone. Take your time, as much as you need, to study it. Find what you need. Let me know when you're ready to pass through."
Player: Are they all the same color? Every lodestone looks the same?
DM: Yeah, you glance through, they're all the same color. Slight variations, and the shapes change a little bit, some are perfectly spherical, some are a little oblong, just whatever shape it eventually hardened into.
