Originally Posted by
Barbarian Horde
New lore has been recently created by WOTC involving him and his goldfish. The idea was if the fish died, the whole guild goes into an uproar to replace the goldfish before Xanathar notices for reasons??? Unfornatly I don't know if this transfers backwards? It's 5e material, but it's official lore? Dunno, thought Id share.
I can't think of any rules given by TSR and Wizards of the Coast for determining outright what is canon.