Goblins sprout from the wounds of devils or ooze forth from the blood of demons. When a demon is killed a ritual must be performed to prevent a horde of goblins from pouring forth from the corpse. Long have the demons and devils attempted to control goblins for their own demonic ends. They have had little success. Goblins certainly make mischief in the world, but it is their own mischief, not anyone else's.
Goblins love making things, inventing things, and breaking things to reshape them for their own pernicious ends. In the songs of goblins are the secrets to making vile constructs, contraptions and machines.
In the Shadow Realm goblins can be found fishing, usually with a box made of thick copper wire and glass, with one side that may be opened. They affix this box to the end of a line and toss it into the Sea of the Dead. When they haul in the line the box is filled with a memory, stolen from the dead and rendered in physical form: a live chicken, a worn boot, creek water on a warm summers day or a birthday cake.
Goblins never wear shoes.