Board Thread:Dark Souls II/@comment-76.179.129.56-20140522041611/@comment-16047389-20140522151902

My guess is to counter-balance the Warmth Pyromancy, which heals everyone, even enemies. It'd be dumb if that was the reason, but I do know that the Lifedrain Patch hurts the caster if they walk in it. Perhaps it hurts white phantoms due to a coding issue.

This raises an interesting question then. If you are summoned as a Mirror Squire, is it possible to aid the host player by casting Lifedrain Patch on the Mirror Knight while healing the host and White Phantoms using Warmth?