Updated: Apr 5, 2022
"So you walk eternally through the shadow realms, standing against evil where all others falter. May your thirst for retribution never quench, may the blood on your sword never dry, and may we never need you again"
Royal Incinerators are monsters that are sent after particularly vicious humanoids, those that kill senselessly and threaten the peace of the realms. In other worlds it will turn murder hobos into murdered hobos.
Born of the fusion between iron golems and heroes of legend, Royal Incinerator are threats to be unleashed as a last resort. The powerful soul animating them allows them to relentlessly charge into battle.
The soul of the incinerator is held inside an iron golem, bound to a brazier. Once the brazier is lit, the incinerator awakens and can be given a singular task, a target to kill. Until that task is completed, the brazier cannot be extinguished. As long as its flames burn, the incinerator will keep coming back to life, stronger and stronger, until the task is accomplished, at which point the incinerator will go dormant again.
Once a mission is given, nothing can stop a royal incinerator, not even the person who gave the order. They are simply considered obstacles to be removed. Nothing is more important than the mission. To kill them for good, one must first kill the incinerator, and then find and destroy the brazier before the incinerator has time to come back from its ashes.
PS: If you're interested, here's a free adventure module for DnD 5e, it contains a lot of cool monsters like the Fallen King, which may or may not be inspired by the Nameless King from Dark Souls 3 ;)