The thing with vomit is that it has to come from someone. So, who threw up FB-sized amounts of vomit?
The clowns after throwing their parties down there of course.
Does Legends Mode say which came first, the clowns or the forgotten beasts? I know that the forgotten beasts begin wandering the underground at the dawn of time, but haven't opened up the circus enough to be familiar with the Legends entries for clowns.
"Back in the mists of time, the Gods decided to create the World. To do so they had to find a way to heat it in the cold voids of space. Demonkind had already forged their own world out of the vile substance Slade, a stone anathema to all creation and only able to be worked through the vile rituals they had created, for slade was truly "dead" stone, with no life in it at all.
Deciding both to imprison their greatest enemies and to create a home for their creations, the Gods poured into the skies of the Demons' world "living" stone (known to mortals as semi-molten rock - rock burning hot with the fresh life of Creation). The Gods knew that if it were not constantly heated, this living rock would cool, and yet the Demons, fools that they were, constantly attacked the living rock, not realizing that their attacks simply heated the rock again and again, keeping it alive. Unfortunately, as the Gods began to pour more and more of the rock onto their creation, they found it quickly lost its life when removed too far from the Demons. It would only remelt once it touched the living rock, creating vast seas of magma that heated the tunnels above. Worse, the living rock itself had been disturbed by this process, creating gaping holes through which the Demons escaped, killing and maiming the first creations of the Gods, warping those they could find into the terrible Forgotten Beasts, leaving the Titans safe on the surface.
Knowing this state of affairs could not last if their weaker creations, the first mortals, were to survive, the Gods created a new substance, imbued with their power: Adamantine. The beautiful aqua-colored ore was poured into the holes, sealing the entrances that the living rock could no longer seal, preventing the Demons from escaping, for its power totally repelled Demonkind.
Unfortunately, as time passed and the first mortals began to carve their civilization from both the surface and the underworld, they discovered the vast shafts of this amazing substance and began to mine it, instantly realizing its divine potency. In doing so, they removed the great barriers the gods had placed in order to keep the Demons sealed. The Demons rose up, slaughtering thousands and escaping into the World, often rising to lead mortal civilizations, such as that of the Goblins. Upon these sites they raised towers carved from the vile Slade that only they could work. Brave adventurers and champions of the Gods forged special swords made from the divine Adamantine and ventured into these dark places to seal the Demons within hell once more. Leaving their swords buried in these places, those who survived swore to defend them for all eternity, binding themselves with oaths of such might that they surpassed death itself. They remain, even today, as zombies and skeletons, driven by their undying thought "none must take the sword!" and nothing more. These undead are totally obsessed with their duty to defend the ancient demonic structures from all interlopers and have been the death of many an unwary explorer.
In retrospect, all this could probably have been avoided if the Gods had bothered to make their all-powerful metal capable of withstanding the swing of a copper pick."
Its the theory rated D for dwarf that i like