Gammastrahl Leviathan

The Gammastrahl Leviathan (German for "Gamma Ray") is a large Leviathan class organism found on Planet 4690C. It is immune to any sort of radioactive fallout and is needed by the player to survive the Gamma Virus. The only living specimens can be found in the Leviathan Sanctuary.

Appearance
The Gammastrahl Leviathan is colossal, seafaring, species having a stocky, entirely armored body and is predominantly pale gray in color, with a slight yellow-green hue in between its armor plates. It has two fins found on the upper portion of its body, similar to that of the Sea Emperor Leviathan, it also has tentacles are adorned with bright yellow-green bioluminescent "bulbs".

The leviathan's head is somewhat small, shaped similar to that of a Brachiosaurus, featuring one large fin-like structure on its forehead, two large mandibles on each side of its rather small mouth, and a glowing hollow between these mandibles. It has five binocular eyes, glowing a bright yellow-green in color.

The Gammastrahl Leviathan's posterior consists of seven long, yet slim tentacles ending with large shield-like structures.

Behavior
Despite its gargantuan size, the Gammastrahl Leviathan's diet consists solely of micro-organisms filtered from the water, much like Sea Emperor Leviathansand the real-life Baleen whales.

It's suggested that in the ancestors of the Gammastrahl Leviathan would have traveled in small schools, occasionally coming to the surface to feast on the microorganisms and small herbivores in shallower waters. When the planet was nuked by the Aftermath, many of the needed food sources for the Gammastrahl Leviathans were killed, causing many of the species to starve. However, those who survived had somehow built up an immunity to advanced radiation and to the many viruses released in the nuclear payloads.

Story
The captive Gammastrahl Leviathan is the last remaining adult of its species and is approximately three thousand years old, having massively surpassed its species' natural lifespan, it is also a parent to at least three eggs and the juvenile housed in the nearby chamber. The three eggs that still remain must be harvested or hatched at some point in the game. The player may choose to hatch the eggs, which will causes the parent to die and release the cure, or they can harvest the eggs which will also release the cure and cause the parent to become hostile and attempt to kill the player.

Almost all of the Gammastrahl Leviathans were killed when the nukes hit, whether that be from starvation or the massive reaction tidal waves is unknown. As the only source of immunity to the Gamma Virus on Planet 4690C, the Gammastrahl Leviathan and its children are the keys to curing life on Planet 4690A of the virus.

The Aftermath studied the last surviving Gammastrahl Leviathans in hopes of finding a cure, using it as a weapon, and breeding them in hopes of harvesting their armor plating for better armor for their drones. However, due to its weakness, possibly old age or illness, studies conducted were failures and caused the deaths of two subjects, leaving only one adult and one juvenile, as well as three eggs, alive.