Bring the Wolf Heart Samples to Apothecary Zinge in the Undercity.
The wolf hearts you acquired possess a quality unseen in similar specimens. There is a toxicity to them that should be deadly to the very wolves in which the hearts beat!
It's quite incredible, and we must study it further. I kept a few samples of the hearts acquired. Take them to my colleague, Apothecary Zinge. You will find her in our headquarters in the Undercity.