Dark Sun: The Scorched World of Athas
Black Waters Oasis
Black Waters is located south of the ruins of Yaramuke, halfway between the cities of Urik and Raam. Whatever you do, don’t drink from either the pool or the stream that runs out of it. When King Hamanu of Urik destroyed Yaramuke, he used such terrible magic that he poisoned this oasis forever. Now, whoever drinks this water feels a chill fall over him and grows deathly ill. You would also be well advised to avoid camping near this oasis; it is haunted by the spectres of those who did not heed this warning.