Re-adds Alien artifacts to the game.
Adds 6 different coloured versions of artifacts to the game, each based on a different damage type.
Adds small versions of artifacts dropped by biters and spitters.
Adds extra damage type versions of big worm
Adds a new Elemental nest that spawns the new biters and spitters
Adds a big piercing biter and big electric spitter
Adds Huge enemies of Acid and Explosive types
Adds Giant enemies of Poison and Fire types
Adds multi-type Titan type enemies
Adds multi-type Badass behemoth enemies
Adds multi-type Leviathan enemies, a real end-game threat.
