The final conflict ends with an epic showdown with Tiamat, the famous 5-headed Queen of Dragons.
http://store.steampowered.com/app/372020/
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As with our other sales, these stack with the Complete the Set bundles for 45% off these adventures and 25% off everything remaining in the bundle that you don't already own. Check the bundle here:
http://store.steampowered.com/bundle/256/