Illusion Castle Underworld

Dungeon Information
Also known as "IC1" this dungeon is difficult for players <130 however the drops can make it worth running. It is a relatively short dungeon and a party of 1-3 people is recommended depending on how strong the party members are.

Drops
Some of the better items that can drop in this dungeon include:
 * +7 Epaulets
 * Perfect crafted Redosmium grade weapons and armor
 * +5 Bracelets & Earrings
 * Slot Extender (High) & Slot Extender (Highest)
 * Astral Bike (RW3)

For a summary of drops see: Dungeon Drops A comprehensive drop table from EST is found at: Illusion Castle Underworld Drop Table

Step by Step Walkthrough
Source: