Æons of Death

Æons of Death is a massive compilation WAD that brings together monsters, weapons, and items from numerous games, such as Heretic, Hexen, Quake, Quake 2, Quake 3, Half-Life, Duke Nukem 3D, Blood and others. ZDoom is required to play it.

The mod uses a randomization code which causes any monster or weapon in a certain class to spawn a random monster or weapon respectively. For example, in place of an imp, a snake imp, or a kilmaat, or a catharsi, or one of several others might appear. Also, in place of a shotgun, a shotgun from Doom 3 or the Arc of Death from Hexen might appear. This guarantees that it will never be the same game twice.

Monsters might also drop weapons, ammo, health, or items such as bottles of medicine, artifacts, or runes which can also be stored in the inventory for later use.