The Devourer

The Devourer is a giant (or from The Necromancer's perspective, small) Cthulu squid that eats literally everything, and evolves as a result. This is your main goal of the game, and dictates the pacing, along with what you want to merge.

While anything can be given to The Devourer to eat (except for final gravestones and the Necromerger), you mainly want to feed it monsters that give it lots of meat, which is the equivalent of experience points.

When trying to feed the Devourer a building you will be promted by a confirmation screen so you wont have to worry about placing it down in the wrong place.