Rusty Hearts—a free-to-play, anime-style multiplayer dungeon crawler published by Perfect World Entertainment—is currently in closed beta, and YOU can get in on the fun if you hurry.
The hack 'n slash action is available to all PC gamers at no cost, pitting the masses against Lord Vlad, as he fights off both humans and half-vampires in his quest for a "pure-blooded future." The current roster of heroes includes sassy witch Angela, melee fighter Tude, and Frantz, the half-vampire.
Players will face bosses throughout their dark dungeon adventure, and can also engage in Player Versus Player combat including Arena, Guild Battle, a Tournament System and more. It's all based around fast twitch combat, so it's probably a good thing that Korean studio Stairway Games has optimized it to work with any PC gamepad.
If that sounds intriguing, get in on it. There are still some Beta Keys available at Crunchyroll's Rusty Hearts page.