Monsters that I didn't convert from Dragon #89 are: killer beetle, bichir (a land walking fish), corkie (a groundhog with horns), duleep (electrified spider webs), explodestool (exploding mushrooms), flailtail (marsh dwelling manta ray), giant horseshoe crab, ihagnim (astral oozes), millikan (a flame throwing tree stump), peltast (a leathery parasite that can heal its host), giant pitcher plant, seastar, scallion (a big fish), giant shrike (a big songbird), sind (marsh dwelling humanoid), star leviathan (astral whale), giant venus fly trap (I'd just use awakened tree stats), vurgen (another giant fish), and the killer whale (already have 5e stats). For the most part, these monsters just didn't interest me, and I'm ready to move on to a new issue.
I might revisit the explodestool as a trap, once I see how the DMG formats them. The peltast could also work as a bio-organic item!
Large fiend (demon), chaotic evil
Armor Class 17 (natural armor)
Hit Points 157 (15d10+75)
Speed 40 ft.
Saving Throws Str +9, Con +9, Wis +7, Cha +7
Damage Resistances cold, fire, lightning; bludgeoning, piercing, and slashing from nonmagical weapons
Damage Immunities poison
Condition Immunities poison
Senses truesight 120 ft., passive Perception 13
Languages Abyssal, telepathy 120 ft.
Challenge 9 (5,000 XP)
Innate Spellcasting. The utukku’s spellcasting ability is Intelligence (spell save DC 16). The utukku can innately cast the following spells, requiring no material components:
At Will: darkness, detect magic, dispel magic
1/day each: lightning bolt, teleport, cause fear
Magic Resistance. The utukku has advantage on saving throws against spells and other magical effects.
Multiattack. The utukku attacks with two claw attacks and one bite attack. Alternately it makes two claw attacks and casts one spell.
Claw. Melee Weapon Attack: +9 to hit, reach 10 ft., one target.
Hit: 16 (2d10+5) slashing damage.
Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target.
Hit: 12 (2d6+5) piercing damage.
Utukku are roughly humanoid in shape, standing about 12 feet high. An utukku has the head of a lion, with long quills in place of a mane, and a scaled humanoid body. It also has huge, white claws on its hands and feet. These creatures are mostly dark red in color, but their faces are a golden-red. An utukku’s eyes are bright yellow with catlike blue pupils.
On the Prime Material Plane, utukku use their powers to spread misery and evil through nearby humanoid communities. They do not attempt to gain followers or lead humanoids, preferring to work alone.