The DLC for this game can only be bought via Steam or as a part of the collector's edition from the website. Because of this, the DLC is not officially sold on Linux, but it can be used with the Linux version after being bought on Steam.
for x in `find . -name "*.dds"`; do convert $x `dirname $x`/`basename $x .dds`.png; done
Whilst in battle, the game would, approximately every 3 minutes, drop from the regular (on an average machine, I do not know the specs of it) FPS of ~60, to < 10 FPS. It would go back to the regular FPS about 5 minutes later, and then repeat this cycle. Cause unknown, fix unknown.