I'm a big fan of the Worm web novel. Or, more specifically, I'm a big fan of the setting and the first half of the novel which really loses focus by the second half. That said, the setting has an enormous fan following which have done a lot of amazing fan stories using the setting and characters. It's a superhero universe, where people gain incredibly varied powers if they endure and survive a traumatic event, the source of which becomes the main plot later.

This is a drawing of the three biggest threats in the first part of the novel, the Endbringers, three extremely powerful beings that attack cities and communities seemingly at random, and are too powerful to defeat, only stall until the worlds premier hero Scion can appear to chase them off.

Leviathan: a hydrokinetic speedster who attack coastal cities and major sources of freshwater. Aside from his physical power and speed, he controls rain and ocean water, creating tsunamis that can drown any defenders and sink entire cities. By the time the story starts, he's completely destroyed Newfoundland and Japan. When he's not active, he hides in the deepest part of the ocean floor.

Behemoth: The first Endbringer to appear, he's nicknamed the "Herokiller" for the sheer bodycount he's created. He's the biggest and physically strongest of the three, and is also an energy manipulator; he can mentally control virtually all forms of energy, and is constantly surrounded by fire, lightning and radiation. He travels by tunneling through the earth itself and can appear almost anywhere on the planet. When not active, he hibernates near Earths core.

The Simurgh: The last to appear, and also the least physically powerful, but in many ways the most dangerous. The Simurgh appears as a giant angelic woman with potent telekinetic abilities, but in reality, she's actually the worlds only confirmed telepath as well; anyone fighting her is constantly subjected to her psychic "scream", which screws with peoples minds and can last for weeks after she's left. More insidiously, the Simurghs appearances creates mental time bombs, creating psychological damage that can go off years afterwards, turning heroes and civilians into psychotic monsters from the trauma they've endured. She specifically targets people who work for the betterment of humanity, and is responsible for turning Sphere, a genius hero who specialized in space travel, into Mannequin, a superpowered serial killer. She's also incredibly difficult to fight because of her ability to see about three seconds into the future, meaning she already knows anything you're going to do. When not active, she stays dormant in low Earth orbit.