Legion

The Priesthood of the duergar colony of Belkor spoke of a prophesized golem-construct so massive, so incomprehensibly powerful, that it would eclipse the sun and tear the civilizations of the surface world asunder. They preached that only Belkor could create such a weapon. That the most devoted workers, crafters, and scientists would have to surrender years of their lives, and years of the lives of future generations, to help Belkor reach their ascension. They called it the Bëmbulikor.

The Bëmbulikor, or referred to in common as 'the War Engine', was a 1300-foot construct made of reflective, magic-proof steel, and thousands of miles of enchanted gears, cables, and nodes that allowed it to breach the bedrock between the Underdark and surface with ease. The War Engine was built to withstand siege-level projectile weapons, weather molten magma, and resist the realm's mightiest known spells. The Bëmbulikor possessed supernatural strength that could split mountains, and a well of radiant fire within its belly that incinerated anything in its path. All of this was made possible by the single most complicated, part of the Bëmbulikor, it's core.

The Bëmbulikor's core was enchanted and built to give it the same, simple, controllable sentience as a construct or automaton. Similar to how a trained artificer or engineer could program a construct's allegiance, or an automaton's automatic behavior, the engineers at Belkor wanted to bond the Bëmbulikor to them. But to do so required a level of engineering and magic achievable only by the Warforged. When Visera Maelstrom aided Belkor Master-Smith Zirildeler in the construction of the core, she used the corrupted power of a philosopher's stone to do so. But, as a precaution should Belkor turn on Terminus, she charged the core beyond what was needed, granting it the smallest semblance of sentience. This would mean should Visera wish it, she could turn the War Engine against its creators and bond it to Terminus. This charge, along with fragments of the philosopher's stone, resulted in the creation of an amalgamation of bodiless, unbound Warforged souls. Upon being freed by Croak and Dagger, the entities simultaneously referred to themselves as Legion. "We are Legion, for we are many."

Legion ceased its attack against Krakenrock, and after releasing Croak and Dagger, submerged itself deep beneath the waters of Krakenrock. It had no desire to fight, conquer, or be anything at all. It only wished for quiet.