Re:AOPG Project Moon Update

The Project Moon update brings the Project Moon / Limbus Company / Library of Ruina crossover to Re:AOPG. The patch adds a new gun-style fighting style, several Mythic-tier crossover accessories, and a stack of new active codes. This page is a complete walkthrough of the new content, the best builds for the new style, and how to redeem the crossover codes.

What’s in the Project Moon Update

The Project Moon crossover update adds:

• Solemn Lament Gun — new gun-style fighting style, drop from the new Project Moon dungeon.
• Limbus Company Sinner Outfits — crossover cosmetic outfits for the 12 sinners.
• E.G.O. Butterfly — Mythic-tier accessory that boosts all fighting styles by 12%.
• Library of Ruina Book — Mythic-tier accessory that doubles XP from completed dungeons.
• New Project Moon dungeon — 4-floor dungeon on Elbaf Coast, drop pool focused on Project Moon items.
• Four new codes — ProjectMoonHype!, LimbusCompany!, LibraryOfRuina!, E.G.O..

The full official changelog is on the Patch notes page.

Project Moon update — Solemn Lament Gun showcase and guide

Solemn Lament Gun

The Solemn Lament Gun is the new gun-style fighting style in the Project Moon update. It’s a mid-range piercing damage dealer that scales with gun mastery.

Slot	Detail
Style type	Gun (ranged piercing)
Damage scaling	80% gun mastery, 20% strength
Range	35 studs
Special	E.G.O. Burst — AoE explosion on the 5th shot
Awakening	E.G.O. Awakening — doubles E.G.O. Burst radius
Best paired	Awakened Saiyan + Dragon + Godhuman

The Solemn Lament Gun unlocks from the Project Moon dungeon boss. Drop rate is 8%. The Solemn Lament is the best gun-style for PvE boss shred.

How to Reach the Project Moon Dungeon

The Project Moon dungeon is on Elbaf Coast, Sea 3. To unlock it:

1. Clear the Elbaf questline (talk to Andre on Dawn Island).
2. Clear 25 Shadow Ruler’s Castle clears (gates the dungeon).
3. Talk to the Project Moon NPC on Elbaf Coast.
4. Pay 50,000 Gems to unlock the dungeon.

Each dungeon run takes 20-30 minutes. The 4 floors each have a themed boss from the Project Moon universe.

Project Moon Codes

Four codes are active for the Project Moon crossover:

Code	Reward
ProjectMoonHype!	(1×) Library of Ruina Book
LimbusCompany!	2× Drop for 60 minutes
LibraryOfRuina!	2× EXP for 60 minutes
E.G.O.	(1×) E.G.O. Butterfly

All four are one-time redemption. The full code list is on the Working codes page.

Mythic Accessories from Project Moon

Two new Mythic-tier accessories dropped with the patch:

E.G.O. Butterfly

• Slot: Accessory.
• Buff: +12% all fighting style damage.
• Drop source: Project Moon dungeon final boss (5% drop rate).
• Best paired with: Sword Saint, Godhuman, or Sharkman Karate builds.

Library of Ruina Book

• Slot: Accessory.
• Buff: +100% XP from completed dungeons.
• Drop source: Project Moon dungeon floor 3 boss (8% drop rate).
• Best paired with: Leveling grind builds.

The full accessory ranking is on the Accessories tier list.

Limbus Company Sinner Outfits

12 cosmetic outfits themed around Limbus Company sinners (Yi Sang, Faust, Don Quixote, etc.) drop from the Project Moon dungeon and the Sinner Vendor NPC at Elbaf Coast. Each outfit has:

• A unique character model.
• A custom idle animation.
• A custom finisher animation for the last-hit kill.

Outfits are cosmetic only — no stat bonus. The full outfit list is on the Outfits and Auras page.

Best Builds for Solemn Lament Gun

The Solemn Lament Gun meta build:

• Race — Cyborg V4 or Awakened Saiyan (ranged scaling).
• Devil Fruit — Magma Awakened (AoE synergy with E.G.O. Burst) or Dragon Awakened (single-target burst).
• Fighting style — Solemn Lament Gun + Sword Saint.
• Sword — True Gryphon (backup melee).
• Accessory — E.G.O. Butterfly.

This build is the strongest ranged PvE setup for the Project Moon dungeon and Elbaf raid farming. The full PvE build comparison is on the Boss Rush mode guide.

Project Moon + Elbaf Synergy

The Project Moon dungeon is gated behind 25 Shadow Ruler’s Castle clears. Veterans who already run Elbaf raids can immediately access the dungeon. The combined Elbaf + Project Moon farm yields:

• Saiyan Spirit (5% per Gomah clear).
• Shadow Monarch’s Crown (5% per Shadow Ruler clear).
• E.G.O. Butterfly (5% per Project Moon clear).
• Library of Ruina Book (8% per Project Moon clear).
• 100+ Awakening Stones per week.

This is the highest sustained Mythic-drop route in the current patch. The full Elbaf walkthrough is on the Elbaf Update page.

Active Codes for Project Moon

Beyond the four crossover codes, these active codes boost Project Moon dungeon runs:

• PrimalSayian — 2× Drop for 1 hour (best dungeon booster).
• E.G.O. — E.G.O. Butterfly (Mythic accessory).
• TradingRevamp! — 5 Trade Tickets (trade the Mythic accessory).
• ElbafHype! — 100 Poneglyphs (Mythic reroll fuel).

The full list is on the Working codes page.

When Project Moon Drops End

Project Moon crossover codes typically expire 4-6 weeks after the patch drops. The crossover is content-limited — Project Moon dungeon remains permanently, but the active codes will retire. Bookmark the Working codes page for the latest drops.

Related Hubs

• Elbaf Update — companion Elbaf content.
• Patch notes — full changelog.
• Updates hub — every Re:AOPG patch.
• Boss Rush mode — raid farming routes.
• Working codes — active code drops.
• Tier list builds — best Project Moon builds.