Marandahir
Crown-Forester (he/him)
Maybe it's a chance to bring back the Ferrous Dragons then and other off-brand Metallics, Chromatics, and Gems like Mithral, Brown, and Obsidian Dragons.Just one quick thing (As I've long put my opinion out there that Greyhawk doesn't offer enough on its own as a setting in this day and again hence our multiple, multiple threads trying to pin down what Greyhawk's identity is):
Those have been generic-fied as Steel Dragons since.... At least 2E. Yeah I know they did a lot of "There's this SUSPICIOUS SIMILAR dragon in Greyhawk called the Greyhawk Dragon" but, they're the same. Same powers. Same gimmick
I recognise that Purple Dragons have been reimagined as Deep Dragons but given how vastly different their looks are I think you could revive them. I think 5e just wanted to simplify the number of Dragons to just 5 per classification (and reduce the amount of terrain clashing - Mercury Dragons would be competing for space with Emerald and Red Dragons, for example, and that might be just too many different volcanic dragons for their taste). But I loved the two 4e Draconomicons, and I could totally see Steel Dragons returning in a Setting-specific book.