Paradox Interactive announces that Defenders of Ardania will arrive for Windows and Xbox LIVE Arcade one week from today. Here's a new GDC 2012 gameplay trailer, and here's word on the game:

Defenders of Ardania presents a deep, immersive game world to play in, featuring three unique races and the themed environments they inhabit. The strategic tower defense gameplay will challenge players to make use of 24 different upgradeable towers to stop the invading foes, along with 24 varied units to send out for counterattacks. With an interactive environment, an arsenal of magic spells, and multiplayer battles included, Defenders of Ardania has more than enough to intrigue the most seasoned defenders of towers everywhere.