The Celandi are a sect within the Blackwidow Sisterhood devoted to the idea of trading life for life. Thus, they have made a particular specialty of healing as well as deadly potions and ointments.
Rarely do they trade their own lives away to aid or restore another. Their rhetoric about balance is usually used to justify any killings that become necessary. However, some widows who have studied the "blood art" of healing propose that "life for life" means that they ought to use their own lifeblood in both healing and killing drams. Terith and Verith Kan are both "Bloodweavers" or "Bloodwrights."