Stats:

Health:90

Inventory:30

Damage: 12(24 to undead one-shotting most undead except zoglins, ghouls(deep dungeons), draugr(also deep dungeons), and withers(24 when under decaying frenzy, 48 to undead when under decaying frenzy)

Abilities:

G: bite(thrash prey in jaws will actually cause it to swallow its prey whole unless a zoglin, ghoul, or draugr is trapped in its jaws)

H:Lunge/grab

V: detect prey(this inflicts glowing on all undead in a 5 chunk radius)

These fish are only found in deep oceans and feed on the undead

How to tame, let it grab an undead mob and then feed it a rotten flesh or advanced undead drop(such as drowned lung, phantom membrane, husk heart, ghoul liver(only in the crusader)) it needs 600% of its max health in kills to be tamed (using rotten flesh multiplies this by 1, advanced undead drop multiplies by 2 and nether star equals 10 the health)

Roles:

Ocean explorer: the darkfish is capable of swimming fast, and can consume drowned for its decaying frenzy buff which halves damage taken and doubles speed and damage dealt

Zombie siege combatant: villages near oceans can easily be saved from zombie sieges by flopping on land to consume the undead eater's prey

Healer: the darkfish can create a brownish blood cloud inflicting instant health to anything in it even healing its rider and other allies (this cloud only occurs underwater)