The sort of ends one might expect someone called the Dark One to pursue -- often difficult to distinguish between the benign and the belligerent, perhaps. The Dark One was not one to hunt down in the hopes of capturing again, but his magic was still wanted, and unlike certain others he was also the most willing to sell. People would continue to encounter him, sometimes offering favors in exchange for other favors in return. Spells and other acts beyond normal means, but always for a price, some of them difficult to pay.