Corroded Skull

The Corroded Skull are floating deformed skulls found deep in the Chasms of The Corrosion. Destroying at least three of these skulls (in a single world) will be a crucial step in game advancement. This can be done with any hammer or any explosive that can break tiles. Corroded Skulls emit a dark green flicker light, similar to Acidic Altars. They are the Corrosion equivalent to Crimson Hearts and Shadow Orbs.

They are found at the bottom of the Corrosion chasms, with three or four found in each end of the claw shape, surrounded by Acidstone.

Consequences of destruction

 * Each Corroded Skull drops items when destroyed. The first will always drop The Vanguard and some Musket Balls.
 * Destroying at least one fills one of the two criteria for a Goblin Army to attack.
 * Every third skull broken summons the Stomach of Cthulhu.
 * Each Corroded Skull destroyed provides a chance for a Meteorite to land.

Messages
The following status messages appear upon destruction of Corroded Skulls:

First Skull: "A horrible chill runs down your spine..." Second Skull: "Screams echo around you..." Third Skull: "Stomach of Cthulhu has awoken!"

Trivia
The skull's corroded state can be a reference to how the Stomach of Cthulhu uses its gastric acid to slowly break the skull down.