Content is now organized by game version and source
This link potentially matches multiple versions of "Ancient Gold Dragon":
Ancient Gold Dragon (System Reference Document 5.2)
CR 24 · Dragon (Gargantuan)
Ancient Gold Dragon (System Reference Document 5.1)
CR 24 · Dragon (Gargantuan)
Ancient Gold Dragon (Monstrous Menagerie)
CR 26 · Dragon (Gargantuan)
Ancient Gold Dragon (Black Flag SRD)
CR 21 · Dragon (Gargantuan)