Elder Evils

Elder Evils can refer to either a 3.5 edition Splatbook about world ending threats the players may face or a group of powerful entities that are the closest things Aboleths have to gods.

The Book

The Elder Evils described in the book of the same name are entities with the potential to end the world. The book instructs the DM on how to base a campaign around stopping one of these beings. Many of them are not stated, as they are too powerful when fully unleashed for the players to stop, but instead only have stats for an aspect of them. Several of them were later adapted to 4th edition by Dragon Magazine as potential sources of power for Warlocks.

Atropus

Known as The World Born Dead, Atropus is a moon sized undead creature that is as old as creation and desires the end of all life. Atropus cannot be destroyed, but the players can drive it away. As Atropus approaches the world necromancy spells become more powerful and the dead begin to rise as undead spontaneously.

Father Lymic

Father Lymic is an entity from the Far Realm with a hatred of sunlight that sleeps in an icy prison who wants to remake the world to be more hospitable to itself and its children, which it creates by spreading a plague that turns the infected into creatures like itself. As Father Lymic comes out of his sleep, the sun starts to go out, and darkness spells grow stronger while light spells weaken.

The Hulks of Zoretha

The Hulks of Zoretha are five giants made of stone from another world that plan to exterminate all life on this plane to make room for them to repopulate it with their own kind. As they awaken, the moon turns red, causing people to experience uncontrollable rage.

The Leviathan

An immense sea monster that will destroy the world if it ever wakes up. As it gets close to awakening, the world is affected by extreme weather.

Pandorym

In ancient times, a group of wizards wanted to threaten the gods, so they summoned an intelligent superweapon from another dimension known as Pandorym, but then betrayed and sealed Pandorym away by separating its mind from its body and imprisoning them separately. Pandorym desires to fulfil its contract with its summoners by killing all the gods, and if it is unable to return home after this it will destroy the world too. As Pandorym gets close to being freed, a glyphs spread across the sky that interferes with the connections between planes, making many kinds of magic more difficult to use, especially conjuration.

Ragnorra

Ragnorra is an entity of corrupted life that wants to remake all life to fit her own ideals of what life should be. She travels between worlds in the form of a red comet, which crashes down on the world and begins spreading her skin over the planet, warping all creatures into aberrations. As Ragnorra gets closer to landing, positive energy spells become stronger but also cause gross blemishes, Ragnorra's spores start to fall from the sky that turn things into swarms of pests, living things gain healing abilities but are slowly corrupted into aberrations, and eventually even the dead start rising as aberrations, while undead are forced to flee unless they are underground.

Sertrous

Sertrous is a powerful Obyrith that was killed in the distant past, but whose spirit clings to life. Sertrous was the one responsible for revealing the secret that divine magic is possible to cast without faith in a god. He is worshiped by a cult of heretical Yuan-ti who claim that he is their true creator. As he gets closer to returning to life, encounters with snakes and snake-like monsters become more and more frequent.

The Worm That Walks

The Worm that Walks is an evil demigod named Kyuss that wants to conquer the world and bring about the age of worms to become a full god. As get gets closer to escaping his prison, the world becomes infested with giant centipedes and other worm-like monsters.

Zargon

Zargon is an ancient evil who once ruled over Baator as the father of the Baatorians before Baator was conquered by Asmodeus and his Baatezu. Although he was defeated by Asmodeus, he could not be killed even by the gods and was imprisoned on the material plane. His horn is nearly indestructible and he will regenerate from it if the rest of his body is destroyed. Now he has given up on reclaiming Baator and wants to conquer the mortal world. As his influence spreads the world is affected by extreme weather.

Aboleth Dieties

While most Aboleths do not worship gods, there are five godlike beings that they pay respects to, which are described in the book Lords of Madness

• Bolothamogg (Him Who Watches from Beyond the Stars): A primal force that keeps the multiverse separated from the outer dimensions.
• Holashner (The Hunger Below): A gigantic centipede squid thing that eats its way through the material plane, leaving behind a black substance that can be compressed into Bilestone, a substance that debilitates non-aberrations.
• Piscaethces (The Blood Queen): The origin of aboleths. She wanders throughout the multiverse spawning new aboleths. If she were to ever return aboleths would see it as proof that the multiverse isn't infinite.
• Shothotugg (Eater of Worlds): A mass of liquid that travels between worlds, poisoning and parasitizing them and slowly changing the laws of the multiverse as it does so.
• Y'chak (The Violet Flame): A pillar of violet flames concealing a form so horrifying it would destroy anyone who looked at it. It encourages mortals to worship evil gods and may be responsible for the creation of many of those gods.