Event Overview: December 2025 Mechanics
Runs December 11-18. Rewards include purple RL doll and valuable drops. Cosmograph benchmarks: 70,000 and 100,000 points. Top clears finish with ~14 seconds remaining.
For last-minute roster upgrades before December 18, NIKKE gems top up discount secure through BitTopup provides fast resource access.
Core Mechanics
Turret Systems: Two turret sets plus one missile launcher per side. Left side: two turret barrages then missiles. Right side: missiles first, then turrets.
Targeting: Boss targets highest ATK unit. Taunters bypass this completely.
QTE Timing: First at 1:20 mark, subsequent after 1:40 elapsed combat time.
Turret Spawn Windows
- First left turret: 2:42-2:36 remaining
- Right turrets: 2:12-2:02
- Additional left: ~2:00 mark
- Further spawns: 1:31-1:22
- No spawns after 1:20—pure DPS window
Destroy turrets when blinking red to negate attacks completely. Right missile launcher should be destroyed from left side positioning.
Three Meta Squad Archetypes
Burst 1: Liter-Led Compositions
Core Units: Liter, Dorothy, Volume, Miranda, Noise, Rapunzel, Jackal
- Liter: Primary CDR provider
- Dorothy: CDR + pierce damage (dual function)
- Volume: Additional CDR
- Noise: Main healer
- Jackal: Damage share prevents burst deaths
- Miranda/Rapunzel: Offensive support
Triple-CDR foundation accelerates burst cycling. Dorothy's pierce damage exploits Alteisen's vulnerabilities.
Burst 2: Blanc-Noir Synergy
Core Units: Blanc, Noir, Dolla, Helm, Aquamarine, Novel, Diesel, Mast
- Blanc + Noir: 20-second CDR synergy (deploy together)
- Helm: Healer + CDR (rare dual role)
- Dolla/Aquamarine: Additional CDR
- Novel/Diesel/Mast: Sustained DPS
Blanc-Noir pairing creates burst windows that outpace standard cooldowns. CDR-saturated environment enables near-constant burst availability.
Burst 3: Pierce DPS Cores
Core Units: Alice, Snow White, Scarlet, Modernia, Anis Sparkling Summer, Noir, Helm, Yulha, Maxwell
- Alice/Snow White: Premium pierce DPS
- Maxwell: Pierce + utility
- Scarlet: Burst DPS
- Modernia: Sustained damage between bursts
- Noir/Helm: CDR and healing
Highest damage output. Exploits Alteisen's pierce vulnerability during defense breaks.
Essential Unit Categories
Pierce Specialists
Maxwell, Alice, Snow White, Dorothy, Harran, Laplace, Burst
Premium tier: Alice, Snow White (exceptional burst damage) Budget options: Harran, Laplace, Burst
CDR Providers
Liter, Dorothy, Helm, Aquamarine, Volume, Dolla
Best: Liter (consistent reduction), Dorothy (CDR + pierce), Helm (CDR + healing)
Healers
Noise, Pepper, Helm, Blanc, Noir, S.Mary, Milk, Emma
Top picks: Helm (dual function), Blanc + Noir (paired synergy), Noise (high output)
Taunters & Damage Share
Taunters: Sin, Noah, Ludmilla, Makima, Biscuit (bypass ATK targeting) Damage Share: Jackal, Poli (distribute incoming damage)
Advanced Strategies
21:9 Aspect Ratio Advantage
Set Graphics to 21:9 for wider field of view. Reveals turret blink states earlier, enables faster reactions. Zero resource cost, immediate benefits.
Turret Destruction Timing
Red blink window: 1-2 seconds. Destroying during this negates attack completely. Track respawn timings mentally, pre-position DPS for immediate targeting.
Cross-Field Targeting
Destroy right missile launcher from left side. Minimizes exposure to simultaneous attacks. Pierce units excel at cross-field shots.
Burst Rotation Optimization
Energy Management
Throttle damage before phase transitions—let burst energy accumulate. Enter new phases with full burst ready. CDR-heavy comps need careful management to avoid wasting skills.
Defense Break Windows
Highest-value damage opportunities. Boss enters defense break at specific HP thresholds. Optimal sequence:
- Burst 3 DPS first
- Burst 2 supports
- Burst 1 enablers
Animation Lock Awareness
Avoid long-animation skills before QTE triggers or phase transitions. Some skills can be animation-canceled for faster DPS. Time skills to complete just before mechanical triggers.
Resource Investment Before December 18
Priority Hierarchy
- DPS units (pierce specialists: Alice, Snow White, Maxwell)
- CDR providers (Liter, Helm, Blanc—multiplicative benefits)
- Healers/defensive (only after DPS/CDR reach thresholds)
Skill vs. Equipment
Skill levels: Consistent, linear scaling. Better value per resource. Equipment: Variable returns. Invest only when reaching critical stat thresholds. OL investments: Highest cost/return. Reserve for validated core DPS.
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Cube Selection
Burst 3 DPS: Cubes amplifying burst skill damage or attack buffs during burst windows Burst 1/2 supports: CDR amplification, healing output, energy generation
Concentrate high-tier cubes on 2-3 core units, not spread across entire squad.
Common Mistakes to Avoid
Mistiming Burst Skills
Don't activate bursts in final seconds before phase transitions. Hold skills if boss is within 5-10% of transition threshold. Avoid bursts immediately before QTE triggers (1:20 and 1:40 marks).
Ignoring Turret Priority
Balance core damage with opportunistic turret destruction. Priority system:
- Destroy blinking red turrets immediately
- Maintain sustained damage on core between spawns
- Ignore non-blinking turrets unless about to attack
Over-Investing in Survivability
Optimal balance: one healer + possibly one defensive utility, rest DPS/CDR. Two healers rarely achieve competitive scores.
If squad survives to time expiration: Need more DPS, not defense If squad dies before 1:00: Add defensive adjustments
Score Optimization
Damage Components
- Raw damage: Largest percentage
- Time remaining: Each second adds bonus points (14 seconds = exceptional)
- Mechanical execution: Perfect QTEs, red blink destructions, damage avoidance
Cosmograph Benchmarks
70,000: Meta comps with moderate investment 100,000: Near-optimal execution with high investment
Target highest achievable tier with available resources. Score progression has diminishing returns—90k to 100k costs far more than 60k to 70k.
Daily Attempt Planning
- Early attempts: Practice and mechanical learning
- Single-variable testing: Change one thing at a time
- Final attempts: Best configuration with full buffs and focus
Reserve final scoring runs for refined strategies. Don't waste attempts while tired.
FAQ
What's the best overall team for Alteisen?
Burst 3 meta: Alice and Snow White (primary DPS), Noir, Helm, Scarlet, Modernia, Maxwell. Pierce-focused, exploits boss vulnerabilities, sufficient healing via Helm, CDR via Noir.
When does the event end?
December 18, 2025. Complete all attempts and claim rewards before this deadline.
How do I survive QTEs?
Triggers at 1:20 and after 1:40 elapsed. Avoid burst skills 5-10 seconds before these timestamps. Keep visual focus on screen center. Practice inputs early.
Can F2P reach competitive scores?
Yes, 70,000 threshold achievable with Dorothy, Harran, Laplace, Pepper, Noise. 100,000 typically needs meta units, but skill partially compensates.
Turrets or missile launchers first?
Destroy right missile launcher from left side early. Then prioritize turrets only when blinking red. Between blinks, focus core damage.
Which characters to upgrade with limited resources?
- Alice or Snow White (primary DPS)
- Liter or Helm (CDR/support)
- Noir (CDR synergy) or Scarlet (burst damage)
This core performs across multiple content types beyond Alteisen.
