Elden Ring PC | Ancient Dragon Smithing Stone drop from Crumbling Beast Grave site of grace

Location: Crumbling Farum Azula

These dragons are listed as Farum Azula Dragon in Fextralife (last link). They are not bosses.

It isn't mandatory to kill this dragon. However, it's impossible to miss since you must pass through this area to beat the game. An Ancient Dragon Smithing Stone is also a valuable item.

Drops:
38,880 runes
Ancient Dragon Smithing Stone

Ancient Dragon Smithing Stone
"Ancient Dragon Smithing Stone is an Upgrade Material in Elden Ring. Ancient Dragon Smithing Stone strengthens armaments up to +25. Upgrade Materials can be acquired through exploration, looting from specific Locations, dropped by specific Enemies or Bosses, given by NPCs, or sold by Merchants."
https://eldenring.wiki.fextralife.com/Ancient+Dragon+Smithing+Stone

Farum Azula Dragon
"Farum Azula Dragons are Hostile Creatures in Elden Ring. They are the many four-winged dragons seen around Crumbling Farum Azula. Some can be found sleeping, while others may fly in and ambush you. For named Ancient Dragons, see Ancient Dragons page."
https://eldenring.wiki.fextralife.com/Farum+Azula+Dragon