This is the Reaper’s version of the D&D Remorhaz. The creature dwells in cold climates, hence the snow base. The back of the creatures gets furnace-hot when it is agitated. I sculpted a pair of eggs out of Green Stuff that mommy is protectively coiled around.
In our Against the Giants campaign, when the characters found this creature at the bottom of the Glacial Rift of the Frost Giant Jarl, they purposely woke it and then ran away. The remorhaz crawled out of its lair, stretched it out across the chasm floor, tucked in its legs, and steamrolled down the length of the rift, flattening and frying about a dozen winter wolves, ogres, and giants. Good times.