The Thessalhydra is a strange and terrible creature
with eight heads surrounding a large, circular mouth
rimmed with jagged teeth. Its maw drips with acid, and
its tail ends with a pair of sharp pincers. The thessalhydra is gluttonous and damaging to any environment.
Attributes
Thessalhydra
Size
Huge
Monster Race
Monstrosity
Alignment
Unaligned
Armor Class
14 (natural armor)
Hit Points
69 (6d12 + 30)
Speed
6m, swim 6m
Attributes
STR
19 (+4)
DEX
12 (+1)
CON
20 (+5)
INT
5 (-3)
WIS
10 (+0)
CHA
7 (-2)
Features
Skills
Perception +4
Damage Immunities
Acid
Condition Immunities
Blinded, charmed, deafened, frightened, stunned
Senses
Darkvision 12m, passive perception 14
Challenge
4 (1,100 XP)
Actions
Multiattack
The thessalhydra makes one maw attack and one flurry of bites.
Flurry of Bites
Melee Weapon Attack: +7 to hit, reach 2m, one target. Hit: 7 (1d6 + 4) piercing damage plus 10 (4d4) poison damage.
Maw
Melee Weapon Attack: +7 to hit, reach 1m, one target. Hit: 9 (1d10 +4) piercing damage plus 5 (1d10) acid damage.
Tail Pincer
Melee Weapon Attack: +7 to hit, reach 2m, one target. Hit: 10 (1d12 + 4) slashing damage, and the target is grappled. As an action, the target can escape the grapple by succeeding on a DC 14 Strength (Athletics) or Dexterity (Acrobatics) check (its choice). Until this grapple ends, the thessalhydra can't use its tail pincer.
Acid Saliva (Recharge 5-6)
The thessalhydra spits a glob of acid at a point it can see within 6m of it. Each creature within 2m of that point must make a DC 15 Dexterity saving throw, taking 18 (4d8) acid damage on a failed save, or half as much damage on a successful one.
Legendary Actions
Description
The thessalhydra can take 2 legendary action, chosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The thessalhydra regains spent legendary actions at the start of its turn.
Detect
The thessalhydra makes a Wisdom (Perception) check with advantage.
Tail Swipe
The thessalhydra makes a tail pincer attack.