Greyhawk Monsters: Thessalworg

Welcome back Greyhawkers! I tried my hand at 5E monster design recently with the Briar Golem. My next attempt, the Thessalworg is based on my love of the creepy weird Thessalhydra which first appeared in MM2. Thessalhydras are a magical combination of a hydra and some stock "thessal-monster" with a huge maw a pincer tail and acidic drool. Other monsters have gone on to reproduce with the progenitor Thessalhydra leading to weirder things like the Thessalmera and Thessalisk. We later find out in Age of Worms AP that a lich named Thessalar originally from Faerun but currently living in Rift Canyon is responsible for their genesis. So yes, DMs feel free to add the Thessalworg to your monster toolbox. If your players complain, blame it on the Forgotten Realms. Enjoy!

THESSALWORG (5E)
This horror is an unforeseen branch in the family of magical hydra hybrids called thessalmonsters. It partly resembles the thessalhydra, except that instead of the giant maw in the center of the ring of snake heads, it has a large wolfish head. Unlike sentient speaking worgs, the thessalworg is a slavering beast, that in particular attacks normal worgs and other canines on sight. Thessalworgs can be found in most any climate or terrain, either singly or in packs.

THESSALWORG (5E)
Large monstrosity, unaligned

Armor Class 13 (natural armor)
Hit Points 45 (6d10 + 12)
Speed 40 ft.

STR 16 (+3)
DEX 13 (+1)
CON 15 (+2)
INT 5 (-3)
WIS 9 (-1)
CHA 7 (-2)

Skill Perception +3
Damage Immunities acid
Condition Immunities blinded, charmed, deafened, frightened, stunned
Senses darkvision 60 ft., passive Perception 13
Language -
Challenge 2 (450 XP)

Keen Hearing and Smell. The thessalworg has advantage on Wisdom (Perception) checks that rely on hearing or smell.

ACTIONS

Multiattack. The thessalworg makes two attacks: one Bite attack, and either one Flurry of Bites attack or one Tail Pincer attack. Alternatively, it may use its Acid Saliva.

Flurry of Bites. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 7 (1d6 + 3) piercing damage plus 5 (2d4) poison damage.

Bite. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 10 (2d6 + 3) piercing damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.

Tail Pincer. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 7 (1d8 + 3) slashing damage, and the target is grappled. As an action, the target can escape the grapple by succeeding on a DC 13 Strength (Athletics) or Dexterity (Acrobatics) check (its choice). Until this grapple ends, the thessalworg can’t use its tail pincer.

Acid Saliva (Recharge 5-6). The thessalworg spits a glob of acid at a point it can see within 30 feet of it. Each creature within 10 feet of that point must make a DC 15 Dexterity saving throw, taking 14 (4d6) acid damage on a failed save, or half as much damage on a successful one.