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Death Knight hero class
When you get a hero to level 55 You'll be able to make a Death Knight character on any desired realm. Kepp in mind You are limited to one Death Knight per realm.

Embark on an inspiring mission of human connection beyond the UCA. Sam — with companions by his side — sets out on a new journey to save humanity from extinction. Join them as they traverse a world beset by otherworldly enemies, obstacles and a haunting question: should we have connected?