Name: The Gates of Deceit and Sword of the Dead
Source: Duke Ghor
When: After Darken Forest, MUST HAVE SPOKEN TO DUKE GHOR BETWEEN BASE BATTLES
Where: Ghor, Messenger in Pub, then the Duke
Join the Duke and head into Numor Mines to find the Third Committee
Enter the first door and take the elevator down to Large-Scale Mining Zone
Walk north to teleport to Excavation Area
Walk south, kill the Greater Demon and shortly after you get teleported to northern side of the Excavation Area
Head south and then west, teleport to Large-Scale Mining Zone
Go north, ignore the small paths on your left side, follow path towards south, teleport to northwest side of Large-scale Mining Zone
Head south and ride the elevator up, you're now at the sword. Very easy fight ahead.
Reward: Trap Formula, unlocks Ring of the Ancient Castle guild!, Duke of Ghor in guild