Magicka: Marshlands | Mythic Sword

Summary pulled directly from Steam - Some text may only be applicable to Steam platform

Left for dead, your party is faced with the terrible hordes of the undead and some of their friends. This challenge contains a large area for the players to move around and plenty of room for the hordes to really spread out and surround you. If you like splashing around in murky waters trying to dismember zombies, this is the challenge for you.

Key Features:

Two completely new challenges with 20 waves each.
New spawn situations such as goblin troops arriving via elevator or zombies crawling up through the ground, all around you.
Completely new challenge environment
20 deadly waves of enemies unseen in challenges
"It came from the swamp" entry point for enemies.