Public Test Realm
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A Public Test Realm, also called a Test Server, is a realm made for trying out features in development for the next patch. Blizzard occasionally announces Public Test Realms or PTRs for players to test features to be implemented in a future patch. You can copy a character to the Test Realm or copy a premade character with lvl 70 epics tier 3. Players on test realms should not be surprised by character wipes, item wipes, or frequent downtime to make changes or apply patches.[1]