Mutation

Difficulty: Class 3
The Mutation level is the 13th level of the Underground.

This level seems dark until you find Liquid Venenium. then it's bright enough to see and is as common as lava on the "Lava" level.

Speaking of lava, when Liquid Venenium and Lava collide, no blocks are made. Which means that the Venenium sometimes goes under the lava and looks super odd.

Crystals also spawn here for unknown reasons, lingering as if relics of a bygone age...

Mutant Mobs also spawn down here, they are twice as powerful while looking exactly the same.

Trivia
When placing water next to Liquid Venenium, the water will imminently stop instead of making a new block. Like maybe Fragmented Cobblestone. (post your ideas Here)

Caves aren't actually that big, causing you to sometimes get stuck.

A normal bucket can pick up Liquid Venenium. Saving you some Fragmented Bedrock.