The Ancient Dragon is the boss of Rukiryo's CS2015
In order for one to join into a CS2015 server, you must type in jackinthedungeon into the code box on the original title screen.
This boss is also farmed by many other players due to its easily obtainable Ancient Rapier.
The Ancient Rapier has close to a 50% - 55% chance to obtain when killing the boss of the dungeon.
This server is no longer available and the only ways to get this is to teleport in with Checked Cashed, or buy it from other players.
The Boss Room: