[@Martian] Okay, I've made those couple tweaks to the script, see what you think of them! I figured Hoard Dragons have a bit of a theme going on, in that they became big enough to delude themselves that strength alone was enough to keep them safe (see magic change and relatively poor flying capabilities). I didn't add it into the history, but personally I think their downfall could also be attributed to their other dragon kin and the Masque not wanting to humble them due to their sheer size and arrogance, which further lead them to overestimate their prowess and underestimate just how deadly humanity was becoming. 

"If it ain't broke, don't fix it." - Hoard Dragons, presumably.