Seige Monster. The creature deals double damage to objects and structures.

Destruction Aura. All buildings rapidly deteriorate and crumble in Flamyr's Presence. Any humanoid-made structures within 30 miles of Flamyr are completely destroyed after 30 minutes.

Unstoppable. No material can slow or stop Flamyr.

Immutable Form. Flamyr is immune to any spell or effect that would alter its form.

Wish Resistance. The spell wish cannot kill Flamyr immediately. In such a case, Flamyr takes 20d10 Force damage and falls prone.

Lingering Whispers. Those touched by Whispering Death are never the same. All creatures who suffer the Whispering Death action die within a year of the action's use.

Displacement. Flamyr projects a magical illusion that makes it appear to be standing near its actual location, causing attack rolls against it to have disadvantage. If it is hit by an attack, this trait is disrupted for 5 turns.

World Ender (Mythic Trait). When Flamyr, The Howling Death is reduced to zero hit points, read aloud:

Flamyr melts into a puddle of bubbling ooze. The ooze begins to float, rising into the air. The pile begins to change in hue, shifting to a mettalic gold. It assembles itself into a pyramid-like structure. A single, glowing, human eye stares into the distance as the pyramid slowly drifts to the ground. A low hum fills the atmosphere, and Flamyr turns its eye upon you.

 After reading, Flamyr, The Jersey Devil transforms into Flamyr, Pyramid of Chaos.

Multiattack. Flamyr makes 2 claw attacks or 150 sting attacks.

Claw. Melee Weapon Attack: +30 to hit, reach 1000 ft., 10 targets. Hit: 75 (7d20 + 2) Slashing damage. 

Bite. Melee Weapon Attack: +30 to hit, reach 1000 ft., 10 targets. Hit: 50 (4d20 + 8) piercing damage, 50 (4d20 + 8) poison damage, and 50 (4d20 + 8) acid damage.  

Sting. Melee Weapon Attack: +30 to hit, reach 1000 ft., 5 targets. Hit: 1 (1d20 - 9) piercing damage. 

Lashing Tentacles. Melee Weapon Attack: +30 to hit, reach 1000 ft., 10 targets. Hit: 150 (14d20 + 3) bludgeoning damage.

Whispering Death. Flamyr whispers an ancient invocation, targeting 1d10 creatures it can see. One minute after using this action, these creatures take 105 (10d20) necrotic damage.

Sonic Blast. All creatures in a 100 ft. line must make a DC 30 Dexterity saving throw or take 150 (14d20 + 3) thunder damage.

Howl (Recharge 4). Flamyr releases a soul-splintering howl. Each creature within a 666-mile sphere centered on Flamyr must make a DC 30 Wisdom saving throw, taking 150 (10d20) Psychic damage on a failed save, or half as much damage on a successful one.

Breath (Recharge 5–6). Flamyr exhales in a 66-mile cone. Each creature in that area must make a DC 30 Dexterity saving throw, taking 63 (18d6) acid damage, 63 (18d6) fire damage, 63 (18d6) cold damage, 63 (18d6) force damage, 63 (18d6) lightning damage, 63 (18d6) necrotic damage, 63 (18d6) poison damage, 63 (18d6) psychic damage, 63 (18d6) radiance damage, 63 (18d6) thunder damage on a failed save, or half as much damage on a successful one.

Discharge Chaotic Energy. All creatures within a 50 ft. sphere of Flamyr must make a DC30 Dexterity saving throw or take 150 (14d20+3) force damage.

Rebuke. Flamyr uses this action after getting hit, but before damage is rolled. The creature takes 21 (2d20) Psychic damage.