Whenever a creature finishes moving through the frigid air on a turn, willingly or otherwise, the creature must make a DC 17 Constitution saving throw, taking 17 (5d6) cold damage on a failed save, or half as much damage on a successful one. A fiend from the Abyss, the Sibriex is a roiling mass of flesh, blood and bile that drips off its body and poisons the ground.fiend (demon) WIS: 16: Gynosphinx 5e (5th Edition) Monster in Dnd Monsters Giant Boar 5e (5th Edition) Monster In Dnd Monsters Ancient Blue Dragon 5e (5th.Everything from which ability scores to max out to which races will give you the best stats (and everything in-between) will be covered. Quite a few lurk in the Underdark too, which in some ways is an alien world of its own. I specifically created these four as they are major players in my current A Complete Guide To Playing A Fiend Warlock In 5e D&D. Your fiend shares your alignment, and you are free to determine its personality traits and flaws.