Red Death

 is a "sea monster" in the Fallout 4 add-on Far Harbor.

Background
Legends around the island tell of a monsterous sea creature that has taken the lives of dozens of seamen looking to vanquish it. However, the truth is much less impressive. A mutation has given this itty bitty mirelurk intense glowing red eyes; any sailor with an ounce of curiosity would be drawn to the source... and into the dangerous shoals, where their boat is beached or capsized by the shallows.

Quests

 * The Great Hunt: the Red Death is a legendary beast and must be vanquished.

Appearances
appears only in the Fallout 4 add-on Far Harbor.