Thommy H-H
Adventurer
If they really feel like they have to for continuity purposes, they should just have them be a cultural group composed of exiles and outcasts from the other dwarven nations (or the descendants thereof) like Tolkien's petty dwarves, with no impact on stats or anything else. It would simply be a backstory element for your hill or mountain dwarf PC, with perhaps the suggestion that some other dwarves have spread nasty rumours about them in the past or something.I'm curious if they will mention gully dwarves ever again in 5E. They were briefly mentioned in Tales from the Yawning Portal as a way to make Sunless Citadel take place in Krynn (replace kobolds with gully dwarves while not explaining what they were for those who might not know). Guessing they'll just leave them in the past without addressing them one way or the other, which is probably for the best.