When the Reaper Leviathan is exposed to damage, it will flinch and roar shortly after being hurt. 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. 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. According to the data bank entry, this roar is a form of echolocation, though the roar does not function like this in game. The Reaper Leviathan usually emits loud, echoing roars audible from great distances. 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. It has two maroon mandibles on each side of its face which slowly get darker, tipped with black claws, four in total. Its head features a large mouth, as well as two pairs of eyes with grey sclera and dark green irises. Most of its fins, along with its back, are red in color. 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. The Reaper Leviathan possesses a long, slim, muscularly built body with four caudal fins and two pectoral fins. Fins and head protrusions included, the creature is just a little shorter than a Cyclops submarine.

The Reaper Leviathan is a massive creature. The Reaper Leviathan is an aggressive leviathan class fauna species usually found swimming in large open areas, such as the Dunes and Mountains. Grab: When health is below 80 this attack will be performed, killing the player.

Subnautica reaper leviathan