As the group heads upwards and to the north and east, they manage to keep their bearings and are startled to find little of note in the interior of the spire. The terrain here is rough and uneven, and dragon bones seem embedded in the ground, but it does not seem like it was formed naturally from magma flows like the rest of the caldera. It was constructed, somehow, perhaps via a powerful stone-shaping ritual of some sort. However, it comes across as incomplete and barely half-formed, given its completely hollow nature and strange, convenient structure where the floor meets the passage leading inward.
Eventually, in the distance, you spot portion of the wall that is broken through. It was difficult to spot because the sun was not shining directly through it, but looking up you do spot several other portions of the spire where there are holes broken through the sides of it where sunlight manages to pierce into the darkness for varying distances, usually ending as it hits another wall. In any case, as you approach the section of the wall that is broken through, you notice that there is no more path to follow--until you spot a yellow canary that flies out of it, then skims the back of the enormous petrified serpent, which lies directly outside the hole in the side of the spire. Following it out and onto the enormous creature's back, you are able to continue your passage upward.
Working your way through the strange spire is confusing and decidedly odd--eventually there is simply no more floor to traverse and you have to move across the petrified serpent's back once more for a great distance, following yellow canaries until finally you re-enter into a small chamber near the top of the spire, some few hundred feet above the caldera's ground level. A steep ramp upwards deposits you atop the spire, and here things are strange indeed.
Stalagmite-like rock formations litter the edge of the spire--it would be quite a drop should you fall off, so it's probably a good idea to not hang around too close to the edge. There are dragon bones littering the floor, including several whole dragon skeletons. The bones and the rock formations form a twisting mess around a circular stone platform on the center of the spire's top. This platform stands out because the stone is of a different color than the dull brown of the surrounding cavern floor, it is a light gray and has a polished look to it. It raises roughly thirty feet above the ground, with a small, rocky ramp that appears to be a defaced portion of the stone platform forming a ramp that could be used to easily ascend it.
By far the most striking feature here is the enormous head of the petrified serpent, and two massive wings clinging to its body about two hundred feet away from the head, hugging the sides of the spire-top. The head is perched above the stone platform, and for lack of a better descriptive term, it is very dragon-like. Its mouth hangs open, as if frozen mid-roar, but it is clearly not alive. Or not animate, at any rate. Given its position hovering over the platform, it's almost as if this is some place to commune with the great serpent--if it were a living thing.
Also on the platform are two more oddities--they appear to be the corpses of two fell dragons. And four of you recognize these dragons; they look very similar to the two dragons that you fought in the Fell King's throne room, though those two dragons almost completely disintegrated after you defeated them, so how they could still be here is a mystery to you. They are also very clearly dead and unmoving. Perched atop the platform on the opposite side from your current position is a yellow canary, which chirps at you briefly, then flies up and over the head of the enormous serpent.