We've certainly been witnessing a rise of Minecraft-inspired MMOs over the past year, including Trove and SkySaga. Now there's an MMO that actually uses Minecraft as the backbone of its game: Mythros.
Mythros is a free-to-play title that predominately focuses on social interaction, although it purports to have plenty of PvE, PvP, crafting, and player housing to enjoy as well. Currently the title is in a non-public pre-alpha state. Players can buy a package that will allow access in the game's upcoming alpha and beta tests, however.
Curious? You can check out Mythros' "journey so far" trailer after the jump!