- Level: 118
- Location: Basement 6 of Ash Abyss.
- Speak with Mayor Thomas (X:105, Y:78) in Tranquil Bay to enter the Ash Abyss. Survive through mazes of mobs and mini-bosses to get to Lord Byss' chamber.
- Respawn: ?? hours after its death.
- HP: 150,000,000
- MP: 18,000,000
Those able to defeat the Lord Byss shall gain the Justice Achievement: Abyssal Hero (Reward: EXP 800,000 and Achieve Pts: 1000).
Loot may include:
- Transmutation Stone III (Level 90 equipment upgrade material)
- Runestone Pack (250 Runestones)
- Coin Chest III (200,000 coins)
- EXP Scroll V (50,000 EXP)
- Lv 2 Lucky Rune
- Mount Catalyst
- Equipment Essence IV
- Guardian Fragment
- Knight Crystal
- Lv 2 Gems: Opal, Belomorite, Obsidian, Pearl, Cat's Eye, Garnet, Amethyst, Lapis Lazuli, Malachite, Peridot, or Amber
- Celestial Ring (Lv 112 defensive ring, Physical & Magic Defense +2628-5256)