monster

Slithering Bloodfin

CR 9

Large Aberration, Unaligned

Reveal Stat Block

Armor Class

16 (natural armor)

Hit Points

93 (11d10 + 33)

Speed

5 ft., swim 50 ft.

str

dex

con

int

-4

wis

cha

-4

Traits

Death Burst.When the bloodfin dies, it explodes in a cloud of toxic blood. Each creature in a 10-foot-radius sphere centered on the exploding bloodfin, including any creature swallowed by the bloodfin, must succeed on a 15 Constitution saving throw or take 10 (3d6) poison damage. A creature inside the bloodfin when it explodes falls prone in the space formerly occupied by the bloodfin and is no longer blinded or restrained by it.

Water Breathing.The bloodfin can breathe only underwater.

Actions

Multiattack.The bloodfin makes one Bite attack and one Tail attack.

Bite.mw 9 to hit (with advantage if the target is a creature missing any hit points), reach 5 ft., one target. ({@damage 2d8 + 5) piercing damage, and if the target is a creature, it is grappled (escape 15). Until this grapple ends, the target is restrained, and the bloodfin can't bite another target.

Tail.mw 9 to hit (with advantage if the target is a creature missing any hit points), reach 10 ft., one target. ({@damage 4d6 + 5) bludgeoning damage.

Slithering Bloodfin

Covered in vicious-looking crimson spines and sleek scales, the slithering bloodfin flashes through the lightless waters of the Netherdeep. As it swims closer, its toothed maw comes into view—just before it unhinges its jaw, clamps down on its prey, and swallows it whole.

A slithering bloodfin looks like a giant eel with a head like a shark's. It magically siphons life energy from swallowed prey and uses that energy to repair damage to its own body.

When a bloodfin dies, its body bursts. The resulting gore is toxic, threatening to infect nearby creatures, until it is dissipated by currents.