The Legend Of Maxx Wiki

Maxx with the iron armor on, in the corruption

The Corruption is an area in the world of Terraria in which no good can survive and evil dwells. It is home to many monsters, such as the Eater of Souls, the Corrupt Bunny and the Eater Of Worlds (the Boss that spawns only in the Corruption.) 

In one comic, Maxx goes exploring and ends up falling into the chasms. He also frustrates June by smashing the Shadow orbs, but it is eventually her who awakens the Eater Of Worlds.

Cyril finds Crummy Mattress in one of the chasms. Maxx also finds a musket when smashing shadow orbs.