Apparently, in RotDG Dungeons and Dragons definitely do not go together. Sometimes casting Dragon's Breath such that the straight-line element of the spell hits a wall section causes that wall section to permanently vanish.
Now that you put it like this... Dragons presumably don't claw their way through stone and make their lairs/hoards. They presumably melt the rock with their fire breath... much more majestic than clawing at it. (Dragons, as far as we know, do not really exist)
I'd always assumed that, since D&D dragons get powerful spellcasting abilities by the time they get really big, they shapeshift in order to enter/exit their lairs, or use other magic.
Well not all Dragons are D&D dragons, but most western ones do have some form of breath-attack But yeah, the shapeshifting theme is also kinda common, and stems from ancient astrology afaik.
They can destroy walls, which you CAN destroy, to access secret small rooms. You have many ways of destroying walls: bombs, mines, skills, magic and more. This isn't the bug.
There is no special texture for them(actually if you destroy just 1 wall in floor, the whole floor will be re-rolled with wall textures), but you can see white corners, after some solid walls, that means there is space. There are a lot of secret locations in 1st floor for example.
Hmm not really. I was thinking along the lines of Scorpio having the Snake (sometimes a synonym of Dragon) and Eagle as transformational identities. Thus, a Scorpio sign can 'transform' or 'shapeshift' (stretching things here) into an Eagle. I actually forgot Scorpio != Dragon , so that was a mistake. Still, it does not seem too unlikely. But I haven't been able to find anything in the short span I searched for it, and I really dislike google for giving me similar results as earlier searches