Abyss: Kraken (EN)

From the publisher:

The struggle for power in the Kingdom of Abyss is more fierce than ever before. Corruption has begun to spread its evil tentacles across the once pure land. The guild of Smugglers, withdrawn to the heart of a cemetery of colossal animals, has allied itself with the Kraken and begun trading in the Nebulis. These precious black pearls can cement your power, but they may also cause your doom.

You can allow yourself to become corrupted to gain access to new powers and new locations, but you will pay the price for it at the end of the game. Even if you decide to remain pure, remember that your opponents will not hesitate to spend their Nebulis during their dealings.

This is an expansion and requires the Abyss Core Game to be played.