- Lineage Piece Rimuru is a top-tier melee weapon added in the Slime Update
- Boss encounter: Rimuru has 40 million HP and requires a pity system to guarantee drops
- Required materials: Slime race, 7 slime cores, 1 mask, and 10 essences
- Mastery grind: Demands 5,000 NPC kills to unlock the powerful R move
- Max damage: The R move can deal over 10 million damage with massive AoE
Overview of the Slime Update
The Slime Update represents one of the most significant content drops for Lineage Piece, introducing a massive new progression ceiling and highly sought-after equipment. Central to this update is the introduction of the Rimuru melee weapon, a devastating endgame item that dramatically shifts the combat meta. Alongside this weapon, players gained access to a new island, a brand-new race system, and an increased max level cap.
Video Highlights:
- Full walkthrough of obtaining the Rimuru melee weapon
- Detailed breakdown of the pity system and drop rates
- Live showcase of all Rimuru skills including the mastery R move
- Farming strategies for slime orbs and required materials
The update raised the max level to 3,500, making pre-boss preparation a significant grind. The new race system allows players to roll for specific racial bonuses, with the Slime race being a mandatory requirement for the Rimuru weapon. Fossil Island serves as the primary hub for all slime-related activities, including the exchange NPC and the boss spawn area.
Before attempting the Rimuru boss fight, ensure you have reached the new max level of 3,500. Engaging the boss under-leveled will drastically reduce your survivability and damage output, making the already lengthy grind significantly harder.
Rimuru Boss Encounter & Pity System
The Rimuru boss functions as a replacement spawn for Sung Jinwoo on Fossil Island. To trigger the encounter, players must first acquire a slime orb and exchange it with the NPC at the Slime Exchange. Once the exchange is complete, defeating Sung Jinwoo will cause Rimuru to spawn after a 5-minute delay.
Rimuru boasts an intimidating 40 million HP, making each kill attempt a considerable time investment. The boss utilizes a pity system, meaning drop rates improve incrementally with each unsuccessful attempt. The optimal strategy involves building pity to 25 attempts before expecting consistent high-tier drops.
| Drop Item | Base Drop Rate | Pity Requirement | Quantity Needed |
|---|---|---|---|
| Slime Mask | 0.7% | 25+ pity | 1 |
| Slime Core | Moderate | 15+ pity | 7 |
| Slime Essence | Moderate | 10+ pity | 10 |
| Demon Lord Title | Low | 20+ pity | 1 |
| Slime Race | 2.5% | Reroll system | 1 |
The pity counter resets only after you obtain the specific item tied to that pity threshold. Do not abandon the server mid-grind, as pity progress is tied to your current session. Building pity to 25 before expecting the mask significantly improves your odds.
The Slime Race deserves special attention because it cannot be simply farmed from the boss. Instead, players must consume slime orbs through a reroll system at a 2.5% success rate. This means you may need upwards of 50 rerolls to secure the race, requiring substantial orb farming.
Step-by-Step Acquisition Guide
Obtaining Rimuru is a multi-stage process that spans several hours of dedicated farming. The journey begins on the new island and culminates in a lengthy boss grind. Follow these steps sequentially to ensure efficient progression.
Reach Max Level (3,500)
Travel to the new island introduced in the Slime Update. Grind mobs in this area until you reach the updated level cap of 3,500. This ensures you deal maximum damage and survive boss mechanics.
Farm Slime Orbs
Defeat slime enemies on the new island to collect slime orbs. You will need a substantial stockpile—approximately 40-50 orbs—to cover both the boss summon cost and the race rerolls.
Roll the Slime Race
Use the slime orbs at the race reroll NPC. With only a 2.5% success rate, expect to spend around 50 attempts. This is one of the most RNG-dependent steps in the process.
Summon and Fight Rimuru
Head to Fossil Island and exchange a slime orb at the Slime Exchange. Kill Sung Jinwoo, then wait 5 minutes for Rimuru to spawn. Build your pity to 25 before pushing for the mask and core drops.
Claim the Rimuru Melee
Once you have collected the mask, 7 cores, 10 essences, the Slime race, and the Demon Lord title, return to the exchange NPC to purchase the Rimuru melee weapon.
The fastest method to farm slime orbs is to station yourself on the new island and continuously defeat slime-type enemies. In approximately one hour of focused farming, you can expect to gather 40+ orbs. Use a server with fewer players to reduce competition for spawns.
Rimuru Skill Showcase & Damage Breakdown
Once obtained, the Rimuru melee weapon immediately proves its value through extraordinary damage numbers. With the Demon Lord title equipped, the weapon's performance improves further, making the title a critical component of your loadout.
| Skill | Base Damage | With Title | Cooldown | Notes |
|---|---|---|---|---|
| M1 (Basic) | 180k | 210k | Fast | Consistent DPS |
| Z Move | 2 million | Higher | Very Fast | Spammable nuke |
| X Move | 2.3 million | Higher | Moderate | Strong burst |
| C Move | High | Higher | Moderate | Multi-hit |
| V Move | 7 crits | Higher | Long | Critical strikes |
| R Move (Mastery) | 10 million+ | Maximum | Long | Massive AoE, wings |
Z Move - Rapid Nuke
- 2 million base damage
- Extremely fast cooldown
- Primary spam skill for grinding
- Excellent for clearing trash mobs
V Move - Critical Barrage
- 7 critical hits per activation
- Sustained burst damage window
- Ideal for boss phases
- Pairs well with Haki boost
R Move - Ultimate AoE
- 10 million+ damage
- Massive area of effect
- Grants visual wings
- Requires 5,000 NPC mastery kills
Always equip the Demon Lord title when using Rimuru. The title provides a noticeable damage boost across all skills, increasing M1 damage from 180k to 210k and scaling the ultimate R move to its maximum potential. The difference is critical for endgame content.
Mastery Grind & Overnight Strategy
Unlocking the full potential of Rimuru requires completing the mastery quest, which demands an extraordinary 5,000 NPC kills. This is widely considered the most punishing aspect of the weapon, requiring hours of uninterrupted grinding.
The most practical approach is an overnight AFK (Away From Keyboard) strategy. By positioning your character in a high-density NPC spawn area and utilizing auto-attack mechanics, you can accumulate kills passively over several hours.
Before beginning an overnight session, ensure your network connection is stable and your character is positioned in a safe but NPC-dense area. A disconnect during an overnight grind will result in lost progress. Server resets may also interrupt your session.
A successful overnight session of approximately 8-10 hours can yield the full 5,000 kills needed for mastery completion. During this grind, you will also accumulate substantial bonus loot:
| Bonus Loot | Estimated Quantity (Overnight) | Usage |
|---|---|---|
| Slime Orbs | 1,300+ | Future rerolls and exchanges |
| Chests | Moderate | Random rewards |
| Trade Orbs | Moderate | Trading with other players |
| Summon Cores | 1,000+ | Summoning system |
Upon completing the mastery quest, the R move becomes available. This skill transforms your character with visible wings and delivers a colossal 10 million+ damage AoE attack, cementing Rimuru as one of the most powerful melee weapons in the game.
Rimuru Acquisition Checklist:
- Reach level 3,500 on the new island
- Farm 40-50 slime orbs from slime enemies
- Roll the Slime race (2.5% chance per attempt)
- Collect 1 Slime Mask from Rimuru boss (0.7% drop)
- Collect 7 Slime Cores from Rimuru boss
- Collect 10 Slime Essences from Rimuru boss
- Obtain the Demon Lord Title
- Purchase Rimuru melee from the exchange NPC
- Complete 5,000 NPC kills for mastery
- Unlock and test the R move on training dummy
Tips, Comparisons & FAQ
The Rimuru grind is undeniably one of the most time-intensive pursuits in Lineage Piece. Players should weigh the investment against alternatives before committing. The Slime Update also introduced the Ichigo sword, obtainable from Hueco Mundo, which requires significantly less effort but offers considerably lower damage output.
While the Ichigo sword is easier to obtain, its damage output and skill utility fall short of Rimuru in nearly every category. For players focused on endgame PvE content and boss farming, Rimuru is the clear investment. Ichigo serves as a viable stopgap for players who are still building toward the Rimuru requirements.
Q: How long does it take to get Rimuru in Lineage Piece?
On average, expect to spend 5-8 hours of active grinding. This includes leveling to 3,500, farming slime orbs, rolling the Slime race, building boss pity to 25, and collecting all required materials. The mastery grind adds an additional 8-10 hours if done overnight.
Q: What is the drop rate for the Slime Mask from the Rimuru boss?
The Slime Mask has a base drop rate of 0.7%. However, utilizing the pity system and building your counter to 25 attempts before pushing for kills significantly improves your chances of obtaining it.
Q: Do I need the Demon Lord Title to use Rimuru effectively?
While not strictly required to equip the weapon, the Demon Lord Title provides a substantial damage boost across all skills. M1 damage increases from 180k to 210k, and the R move reaches its full 10 million+ damage potential with the title active.
Q: Is the overnight mastery grind safe?
Overnight grinding carries inherent risks including server resets and disconnections. Ensure a stable connection, position your character carefully, and understand that progress may be lost if the session is interrupted. The 5,000 kill requirement typically takes 8-10 hours.
Q: Can I get the Slime Race from the Rimuru boss directly?
No, the Slime Race is obtained through a separate reroll system. You must consume slime orbs at the race reroll NPC for a 2.5% chance per attempt. Expect to spend approximately 50 orbs to successfully roll the race.