Alien Biome

To get access to Alien Biome, You need to gather at least 3 of the 4 Elemental Orbs from Bosses:
 * -shadow.png Shadow Orb,
 * -plant.png Plant Orb,
 * -fire.png Fire Orb
 * -stone.png Stone Orb
 * Then kill Mutant Chick and the Master, and place orbs on the Altars.

Alien Teleporter

Alien Monsters Drops:

Alien Blood

Dart of Soulsucker

Fang of Brutor

Leg of Tripod

Tail of Scavenger

Mother Brain