Plezzzz,
If sleeper can return, Gjallarhorn definitely should, it had lower DPS than sleeper in D1, so it definitely wasn't broken.
Plezzzz don't drop dragon's breath on us, I'd be so upset if we get dragon's breath instead of Gjallarhorn
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Only if they use the original quest from rise of iron dlc and the quest line does not include either gambit or the crucible