Horrors are a generic name for a diverse ecosystem of creatures that originate in the deepest of metaplanes. They cross over en mass near the peak of the mana cycle, a time known as The Scourge. Some mindless Horrors simple consume everything in their path, ravaging the Earth. The more intelligent ones corrupt their prey, feeding on their despair before twisting them into inhuman monstrosities or just throwing them away.
Their only single defining characteristic is that they are antithetical to things that metahumans would consider good. They cannot create, they can only corrupt or destroy.

During the Fourth World, a group of dragons summoned a powerful metal elemental using ritual conjuring. They had hoped that it would be able to protect them from the coming Scourge. It failed, miserably, and was instead transformed into a Horror, itself. Know as artificer, it looks like a giant steam engine turned inside out, it swims through earth like a whale or runs along the ground on metal wheels. Its favorite thing to do is build elaborate trap mazes and it feeds on the suffering of those greedy adventurers that fall into its traps. It can attack multiple characters simultaneously with giant pneumatic spikes that protrude from its body or simply run people over when it is threatened. But it can only materialize at the very peak of the cycle.