Ark-rath

Ark-rath are a unique kind of demon, as they are not native to the abyssal plane, they are created from amalgamated piles of gold, food, bodies and other valuables, most commonly assembled together by krawl, lesser demons that invade and pillage the Tellurian plane for materials, in hopes of summoning an ark-rath.
Because of their method of creation, ark-rath have no set form, just a gruesome conglomeration of whatever was used to make them, animated by demonic souls infused into them by abyssal rituals.
Ark-rath are extremely powerful, and the few times they have been successfully created they have wreaked absolute havoc, with incredible destructive power and strategic prowess; if an ark-rath is allowed to live for too long, the casualties and damage it would cause would easily allow the krawl under its command to create another of its kind, spiraling out of control, eventually leading to the inevitable takeover of Tellus by demonic forces. As such, it is the top priority of governments to rout out any signs of krawl activity before they have a chance to develop a foothold.

Om-rath

Om-rath are similar in function to their larger Ark-rath brethren, though they only require sacrifices of magical power, instead of materials. Due to this unstable nature of summoning, the Om-rath are also unstable by nature; their blood and flesh is corrosive, and they attack in savage, relentless flurries. Despite this, they are also extremely adept at hiding in out of reach places, able to climb walls and fit into gaps that only a creature half their size might otherwise get into. Om-rath, though not as apocalyptically dangerous as Ark-rath, are a considerable threat that should be dealt with as soon as possible.