The Unending: find the real one.

What it is

A jellyfish with a bell as big as a house and tentacles hanging fourteen metres below it. It cannot be killed in the usual way: when its health runs out it bursts into a dozen glowing young, and only one of them is the Unending. It is based on the "immortal jellyfish", Turritopsis dohrnii, which turns back into a baby and starts its life again.

Where and when it comes

• At night only, over the Coralreach, the Tidewash Shallows and the Kelpwood Deep, in water at least eight metres deep.
• It rises 28 to 40 metres from someone who is in the water or on it, in a boat or on a jetty. The Codex hint is "Lights under the reef at night".
• At dawn it fades back into the dark, unless you are in the middle of the swarm.
• After one is slain, another cannot come for about 25 minutes.

Stats

Thing	Value
Health	900
Bell radius, full grown	3.6 m
Tentacle length	14 m
Drift speed	2.4 m/s
Sting	11 damage, about every 1.3 seconds, within 7.5 m of the bell. It also cuts your sideways speed in half.
Shock	15 damage to everyone in the water within 16 m, after 1.2 seconds of the bell swelling with light, about every 7 seconds
Signature: Coil Sweep	A lane 1.6 m either side of its path toward you, 12 damage, 1.2 seconds of warning, about every 10 seconds
Wait before another comes	About 25 minutes

Phase one: the jellyfish

It drifts toward whoever is in the water, keeping its bell just above their depth. Its tentacles sting anyone under or beside the bell, and every few seconds the bell glows brighter and throws a shock through the water round it. Only people in the water feel the shock, so a boat deck is safer, though stings still reach a boat's crew.

Part	Damage taken
Heart (glowing in the dome)	Two and a half times
Bell	Normal
Tentacles	30 per cent

The heart shows through the dome, so any shot aimed through the bell at the heart counts as a heart hit. Below half health it is enraged: it drifts faster and stings and shocks more often.

Phase two: the swarm

When its health reaches zero it bursts into twelve young. One of them is the real Unending, and its light beats out of time with the rest. Strike a decoy and it pops. Strike the real one and the Unending is gone for good. In the swarm only the young can be hit, and the clock is running.

• You have 60 seconds to find the real one.
• If time runs out, it grows back where the real one was, on 60 per cent of its health, and the swarm vanishes.
• Each regrowth makes it 25 per cent quicker, its stings and shocks hit about 15 per cent harder, its shocks come more often, and next time the swarm hides it for ten seconds less (never less than 30).

Tips

• Bring friends. One person can look for the beating light while others pop decoys.
• Do not waste the first minute of the swarm swimming in circles: pick the young whose glow is out of step, and check it first.
• Keep clear of the tentacles. The sting slows you, and a slowed swimmer eats the shock.
• If it grows back, you have lost the easy part of the fight but not much health on your side. Start again on the heart.

What it drops

Drop	Amount
Glow jelly pieces	16 to 25
Abyssal pearls	2 to 4
Gold pieces	2 to 5
Trophy	Unending Coil

← Back to the wiki · Last updated 25 October 2026. Mantlenaut is in alpha, so things change.