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Rezzer is a nickname for any group or party who can "rez" (resurrect). Not having someone in this role can slow down group progress due to dead members having to run to their corpses after they die. Previously, this was a problem with druid healers because they could only resurrect once every 20 minutes, but now that all classes that can heal can resurrect, it is very unlikely that you will ever need to look for a separate rezzer.