My Entry for the Rift Colossus contest.
Plaguebearer's appearance through the Death Rift marks the start of the end. The colossus is an entire invasion horde all on its own. The undead Riftspawn writing inside his chest and stomach cavity may be weak, but they are endless in number. Plaguebearer absorbs the death around him and creates more living dead. The only way to stop the invasion is to kill the source: the towering death colossus himself.
This is probably the most detailed I've gone into a piece. Each one of the zombies inside the colossus's chest and stomach was painstakingly painted in. Full view for details!