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A 21-year-old man from Pennsylvania, USA has been arrested for allegedly raping a 14-year-old girl and taking part in a horrific blood-letting ritual.

Jonathan Ryan Davis is alleged to have made three teenage girls drink his blood and slit their wrists so he could drink theirs.

According to the Pittsburgh-Tribune Review, Davis told the police that the ritual is part of an online Korean video game called Mabinogi, of which he was a fan.

The massively multiplayer online game may be distributed by a Korean company but it takes its name from Mabinogion, a Welsh legend.

The game was first released back in 2004 and allows players to choose to be either an elf, a human or a giant.

Like many online role-playing games, Mabinogi requires players to explore areas and kill enemies.

As players proceed through the game they are able to upgrade their characters and even get married and own pets.

And while the gore doesn't reach the levels of current games - such as the recent Doom reboot - Mabinogi has been branded "violent" by reviewers.

"Parents need to know that there is plenty of violence in this massively multiplayer online role-playing game (MMORPG) -- the player receives a sword about 15 minutes into the game," wrote Common Sense Media.

"A "smash skill" move has your character stabbing an enemy with a long sword and then using his boot to kick the injured character off the blade," said the site.