We all know what Games of Thrones is about and why it's popular. It's an orgy of violence, deceit and incestuous relationships liberally sprinkled upon an orgy of spectacularly gym-fit naked bodies writhing in sexual bliss and manipulation. It's Dungeons & Dragons for Generation Y; the Wuss Generation, to use Bret Easton Ellis' vernacular, too cool to admit to liking precisely this kind of fantasy when they were at school. Yeah, it existed, but it meant reading.

Today, to many, Game of Thrones and its cast of simultaneously lovable and despised damned, not only represents the pinnacle of 'mature' fantasy entertainment, but it's the only 'mature' fantasy entertainment. As false as this is, it's understandable. Look around the popular media landscape and its genre peers seem confined to the wholesome, boorish and outdated family fare epitomised by Lords of the Rings, The Hobbit and Pirates of the Caribbean. Each of these telling stories and serving relationships that fit neatly somewhere along the official Predictable-to-Inevitable scale.

There is a genuine challenger to Game of Thrones' position as King of the Andals Adult Fantasy realm, though. You just need to look to the world of videogames to find it and be prepared to delve into the story of a man with even more grey hair than Gandalf. The Witcher 3 is released on 19 May, and here are the reasons why it matches (and exceeds, in some cases) Game of Thrones in the 'adult only' stakes.