The Unsinkable is a name/title I came up with for the fantasy concept brief, which contains the concept of world flood, piracy, and mythical predatory creatures living underwater. I then decided to do weapon concept for the brief. The name 'epilithic' came after the final design is finished, and the word 'epilithic' itself is a term for plants which grow on a rock, which explains how this blade works when picked up by the user.
This is the result of my concept art project at Syn Studio's online concept art class "Intro to Concept Art", directed by Nicolas Gosselin.