Talk:Nasus/@comment-5187635-20130425110025/@comment-3308937-20130425110550

"Tiamat, Ravenous Hydra and Iceborn Gauntlet will proc when using Siphoning Strike, but only the attacked unit's death will grant the permanent bonus damage. In the former 2's case, the bonus damage from Siphoning Strike will only apply to the attacked unit."

From the ability details page