http://tvtropes.org/pmwiki/pmwiki.php/TabletopGame/CthulhuTech

"Aeon War Syndrome isn't losing your mind. It's losing your friends. It's losing your family. It's losing whatever hope you might have had left. They say war is hell. I've seen hell. This is worse."

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CthulhuTech is a tabletop roleplaying game that can be described as Neon Genesis Evangelion and the Cthulhu Mythos put into a blender and set to purée.

It all begins when a scientist discovers a Tome of Eldritch Lore (called ''The Mysteries Within") and uses the information within to create the Dimensional Engine (D-Engine), an infinite-energy Magitek device deriving power from another dimension. Though both the creator and her apprentice were driven insane by the design process, the D-Engine proves to be a success and soon makes futuristic technologies like Humongous Mecha and Anti-Gravity possible.

This development does not sit well with the Migou, a local group of Starfish Aliens from Pluto that pride themselves on their complete and utter superiority to mankind. They declare war on Earth, first via the Nazzadi, a cloned puppet race of Proud Warrior Race Guys created from the human genome. After the Nazzadi discover their true origins and defect to the side of humanity, the Migou take to the stage of war personally with their own semi-biological mecha and a perfect form of Brainwashing called assimilation. This conflict is known as the Second Arcanotech War, and devastates the Earth.

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It is now the era of the Aeon War. Humanity has survived the Second Arcanotech War thanks to the totalitarian (but otherwise okay) New Earth Government, but greater threats are stirring under the surface. Various Eldritch Abomination cults are enjoying a resurgence thanks to the development of Functional Magic and are attempting to revive The Old Ones from their slumber. An army of Deep Ones lurk below the waves of the ocean, planning to swarm the land and enslave/transform its people. An avatar of Hastur (He Who Must Not Be Named) has been summoned into the world, organising its crazed devotees into the trigger-happy "Rapine Storm" that threatens to sweep across the world like a plague. And the Migou, stubbornly proud and terrified of the idea that even one of the Old Ones could be awoken, have declared war on everyone.

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However, all is not lost. Realising that they were ill-equipped to fight against all of these threats at once, the New Earth Government have been busy creating new weapons to defend the last bastion of humanity: the Engels, a line of Evangelion-esque bio-mechanical super-mecha with apocalyptic firepower and a mind of their own. Meanwhile, there are factions that fight their own shadow wars against the darkness, such as the Eldritch Society and their Tagers, a group of elite agents that have literally fused their bodies with an alien symbiont to gain otherworldly power.

And so it begins, in a brave new world that teeters on the brink of complete collapse. You find yourself on the front lines with your futuristic weaponry or otherworldly powers as the only barriers between you and the madness that lies beyond reality. Good luck.

The following books are part of the series.

CthulhuTech (Mongoose) — The core rulebook

Vade Mecum (Mongoose) — Companion which details para-psychics, zoners, additional spells and mecha for various factions

Dark Passions (Mongoose - black and white; Catalyst - color version) — A sourcebook for cults

Damnation View (Catalyst) — A metaplot sourcebook for 2086

Mortal Remains (Catalyst) — Details culture, society of the New Earth Government, and their enemies, the Migou

Ancient Enemies (Sandstorm) — Details the struggle between the Tagers of the Eldritch Society and the Chrysalis Corporation

Unveiled Threats (Sandstorm) — Details the armaments, devices and technology of the Strange Aeon

Burning Horizon (Sandstorm) — 2087 Metaplot sourcebook

This Tabletop RPG provides examples of: