A leech-blade is a magical weapon forged by a mage-smith. It seeks out and drains life-force energy, killing it's victim. A leech-blade will actually shriek in anguish when it's destroyed. In Magic's Price, a mage working for Leareth threw a leech-blade at Treesa. Vanyel jumped in front of her and was hit with it instead. Savil summoned Starwind and Moondance k'Treva to deal with the problem. In the case of Herald-Mage Vanyel, Savil had additional time to get help because the blade was feeding from both Vanyel and his lifebonded, Bard Stefen.