The Reaper Leviathan is an aggressive leviathan class fauna species usually found swimming in large open areas, such as the Dunes and Mountains. It is the third-largest aggressive creature in the game and fifth largest overall. There are a total of twenty-two Reaper Leviathans in Subnautica.
Spoiler alert: The following section contains story related material.
The Reaper Leviathan is a massive creature. Fins and mandibles included, the creature is just a little longer than a Cyclops submarine.
The Reaper Leviathan possesses a long, slim, muscularly built body with four caudal fins and two pectoral fins. It also has two dorsal fins running along the length of its entire body, and two ventral fins taking a small portion of its belly. Most of its fins, along with its back, are red in color. The fins and other red areas of the body possess slight bioluminescence.
Its head features a horn (most likely used for ramming its prey), a large mouth, as well as two pairs of eyes with grey sclera and dark green irises. It has two maroon mandibles on each side of its face which slowly get darker, tipped with black claws, four in total. Multiple scars can be seen on the body, particularly around the facial area, and the bluish-white skin appears similar in texture to human skin.
The Reaper Leviathan emits loud, echoing roars audible from great distances. According to the data bank entry, this roar is a form of echolocation, though it does not function like this in-game.
It also seems to circle its prey (or more commonly the player) for a few moments before attacking and often strikes from behind by surprise.
The Reaper Leviathan often swims deeper down but not quite at the seafloor. The player can use this advantage and swim on the surface to avoid detection.
The Reaper Leviathan is less likely to notice the player if they use a Seaglide instead of a submersible.
The Reaper Leviathan does not attack the Camera Drone.
If the Reaper Leviathan manages to grab the player, the creature will hold its victim in its mandibles, pause for a second while roaring, and then proceed to pull the player into its mouth, killing them instantly.
When the Reaper Leviathan is exposed to damage, it will flinch and roar shortly after being hurt.
The Reaper Leviathan is capable of a massive attack that inflicts 80% damage on the player if attacked outside of their submarine. It is also capable of grabbing the Seamoth and shaking it around. Doing so will deal about 40 - 60% damage over about ten seconds to the vehicle before it lets go. However, if hit with the Seamoth Perimeter Defense System, it will let go instantly.
The Reaper Leviathan has been observed to grab a Seamoth and a Prawn Suit and smash it down to the seabed, destroying it completely afterward.
The Reaper Leviathan will also grab the Prawn Suit. If it succeeds, the damage incurred will only be around 15-25%.
However, if you wear a Reinforced Dive Suit, you only take 40% damage instead of 80%.
Data Bank Entry
Leviathan class species are vast organisms at the top of their respective food chains. This species is a streamlined hunter, with highly developed senses.
1. Powerful Mandibles:
Motivational note: Congratulations on getting close enough to scan it and living to see the results!
Assessment: Extreme threat - Avoid in all circumstances
- The Reaper Leviathan's eyes used to emit bright green bioluminescence, but in the Ghost Update, it was given a new model that no longer gives off any bioluminescence from the eyes.
- The Reaper Leviathan's body, as well as color scheme, resemble that of the oarfish, a real-life creature. Whether this is intended or not is unknown.
- The Reaper Leviathan was originally modeled at a similar size to the Boneshark and Sand Shark. Later on, it was made much larger than what had been previously planned.
- A Reaper Leviathan used to spawn in the Mushroom Forests near the Aurora.
- The Reaper Leviathan is one of the only two Leviathan Class organisms on Planet 4546B whose eggs are never seen, even with the aid of console commands, with the other being the Sea Treader Leviathan, suggesting they may reproduce through other means, as opposed to egg-laying.