Keepers of the Stones II: Dark Stones is an expansion for the main mod that enriches gameplay with four new dark stones. Their magical power is drawn from darkness itself: Stone of Thirst, Stone of Chaos, Stone of Horror, and Stone of Filth.
To obtain one of these stones, you must defeat the Cursed Guardian. After defeating him, you need to die in the Cursed Forest without choosing any stones from his chest. As a result, you will randomly receive one of the dark stones.