Power infuses the target's party and raid members, increasing their Shadow resistance by X for 1 hour. If the target is in your party or raid, all party and raid members will be affected.
Shadow Protection is a priest buff that increases a target's party and raid members shadow resistance. It is instant cast and has a 40 yard range.
This spell is somewhat useful against warlocks and shadow priests as it significantly boosts your resistance to shadow spells. However it is best used in a group setting against mobs that deal shadow damage