Humble Bundle is offering Dark Souls II for only $12 as a promotion for their monthly subscription pack. Note: you do not have to commit long term in order to receive the game.
Prepare to Die again in the complete Dark Souls II experience with Dark Souls II: Scholar of the First Sin. Hallmark challenge & reward await you with augmentations, additions and enhancements fueled by the passion and talent of famed Japanese studio FromSoftware.
As for Humble Monthly:
If you get the monthly subscription to purchase Dark Souls II, you can cancel immediately.
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