Mass Resurrection was a Guild Perk granted at guild level 25 that would resurrect all raid and party members when cast. This spell worked on both guild, and non-guild party/raid members nearby and gave a 10 minute debuff (which persisted through death) that locked players out of mass resurrection. As of the World of Warcraft: Legion systems pre-patch (Patch 7.0.3), this guild perk has been removed. However, a spell of the same name is still available to discipline and holy Priests.