Mongil Codex · Slayer artifact · SR
Sinister Darkness
4-star SR
Slayer- SR
"That monster is mine. I'll finish it off to console her soul." - Isuka, the undying one
Main effect
Activates as soon as the artifact is equipped — no reinforcement required.
Requiem Strike Ⅰ
When equipped by an Assassin character, grants the following effects. Using a Special Skill increases Basic Attack DMG by 5% (Cooldown: 0.2s, Duration: 10s). Landing a Basic Attack on an enemy increases Ultimate Skill DMG by 2.5% (Max Stacks: 2, Cooldown: 0.2s, Duration: 10s).
Fusion bonuses
Bonus effects unlocked by reaching Fusion levels — applied on top of the artifact's main effect.
- Lv. 5
Gains a 0.06% ATK Boost for every 10 points of Assassin proficiency. (Max: 5%)
Overlap effects
Reinforce past these milestones to unlock additional effects on top of the main effect — the artifact keeps every overlap it has earned.
When equipped by an Assassin character, grants the following effects. Using a Special Skill increases Basic Attack DMG by 5% (Cooldown: 0.2s, Duration: 10s). Landing a Basic Attack on an enemy increases Ultimate Skill DMG by 2.5% (Max Stacks: 2, Cooldown: 0.2s, Duration: 10s).
When equipped by an Assassin character, grants the following effects. Using a Special Skill increases Basic Attack DMG by 6.9% (Cooldown: 0.2s, Duration: 10s). Landing a Basic Attack on an enemy increases Ultimate Skill DMG by 3.4% (Max Stacks: 2, Cooldown: 0.2s, Duration: 10s).
When equipped by an Assassin character, grants the following effects. Using a Special Skill increases Basic Attack DMG by 7.5% (Cooldown: 0.2s, Duration: 10s). Landing a Basic Attack on an enemy increases Ultimate Skill DMG by 3.8% (Max Stacks: 2, Cooldown: 0.2s, Duration: 10s).
When equipped by an Assassin character, grants the following effects. Using a Special Skill increases Basic Attack DMG by 8.1% (Cooldown: 0.2s, Duration: 10s). Landing a Basic Attack on an enemy increases Ultimate Skill DMG by 4.1% (Max Stacks: 2, Cooldown: 0.2s, Duration: 10s).
When equipped by an Assassin character, grants the following effects. Using a Special Skill increases Basic Attack DMG by 10% (Cooldown: 0.2s, Duration: 10s). Landing a Basic Attack on an enemy increases Ultimate Skill DMG by 5% (Max Stacks: 2, Cooldown: 0.2s, Duration: 10s).
Stats
- ATK
Reinforcement
- Max level
- 60Lv.
- Total EXP
- 8,653,849EXP
- Total gold
- 120Gold
Comments
Guides
In-house guides re-tested every patch.
Guides and articles content remains in English.
Mongil: Star Dive — Beginner Guide
Adventure map, jumping, gathering and the first-week checklist — every core mechanic the in-game tutorial walks you through, written in one place.
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Reroll Guide — Best Targets and Stop Conditions
Best characters to chase on a fresh account, the fastest reroll path, and when the meta says you should stop and commit.
Best Team Comps — Destroyer, Slayer and Flex Slot
How team building actually works in Mongil — the Destroyer + Slayer + flex template the Stagger system rewards, when to break it for element-locked counters, and the Brawler-led sustained-DPS variant.
Combat Basics — Hold Attacks, Switch Skills, Ultimates
Basic attacks, special skills, switch skills and ultimate timing — the hold-input combat system explained without the in-game popup spam.
Frequently asked
- Who can equip Sinister Darkness in Mongil: Star Dive?
- Sinister Darkness is a Slayer artifact, so any Slayer character can equip it. The main effect activates whenever the artifact is equipped, regardless of reinforcement level.
- What does Sinister Darkness's main effect do?
- Sinister Darkness's main effect activates as soon as the artifact is equipped on a Slayer character — see the Main effect section above for the full breakdown. Overlap effects unlock as you reinforce the artifact past key milestones.
- How do I reinforce Sinister Darkness?
- Feed Mana Cores at the reinforcement bench. Sinister Darkness requires 8,653,849 total EXP to max out, with overlap effects unlocking at scheduled milestones.
- Is Sinister Darkness worth pulling in the current patch?
- SR artifacts like Sinister Darkness carry the ceiling for Slayer damage and survivability. Compare its main effect against your roster's needs before spending pulls.
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