From official site:
Magicka is an action-adventure game set in the fantasy world of Midgård, where elemental magic rules the land, goblins and trolls are perfectly harmless – well, perhaps not entirely, and all the villagers are wise-cracking smartalecks.
The story begins amidst a great crisis, and an urgent quest falls to you, Wizards of the Order of Magick. It would seem that the capital city of Hávindr is under seige! So alas, you must leave your comfortable castle filled with delicious hot dogs and fancy cheeses, and hurry to the aid of the King.
In your travels you will fight your way through 13 levels, each more fiendish than the last. You shall draw upon the aid of magickal spells, freely combined from the eight elements. As you progress, you will learn the delicate art of annihilating your enemies with the awesome powers of ancient Magicks. As if that’s not enough, you can also test your skills in the various challenge modes, and duel your friends (or enemies) in player vs player battle mode.
But enough talk! Time to get your robe on!