Sanguine Bond

Whenever you gain life, target opponent
loses that much life.
"Love, which permits no loved one not to love,
took me so strongly with delight in him
that we are one in Hell, as we were above.
Love led us to one death. In the depths of Hell
Caina waits for him who took our lives."
This was the piteous tale they stopped to tell." -Dante's Inferno