On even rarer occasions, the Quickening overwhelms an immortal with personality traits of the immortal they killed, resulting in corruption (a "Dark Quickening") or a new perspective that leads them towards remorse and altruism (a "Light Quickening"). The immortal Darius was said to have been ruthless until absorbing the Quickening of a particular immortal turned him into a kind pacifist, leading him to become a monk. The immortal Native American named Coltec is said to have a special gift to absorb the darkness of others. After centuries of this and hunting many evil immortals, he becomes overwhelmed and corrupted. Forced to kill Coltec, Duncan is overwhelmed by the Dark Quickening and engages on a violent rampage until he kills a wise and noble immortal whose Quickening partially restores his balance. He later undergoes further healing at a spring said to be magical in nature.