Zenless Zone Zero's Hollow Zero bounty system delivers substantial Polychrome rewards before version 2.5. Lost Void offers 3,200 Polychrome, Withered Domain provides 1,440, and weekly bounty commissions yield 960 over six weeks. Time-limited events—Advanced Bounty Area Patrol (December 11-16, 2025) and Data Bounty Combat Simulation (December 24-29, 2025)—enable maximum premium currency acquisition through strategic farming.
Understanding Hollow Zero Bounty System
Hollow Zero represents ZZZ's primary endgame content for sustained Polychrome farming. This roguelike mode unlocks during Art of War Lite Edition in Chapter 1 Intermission after completing Earlybird Ticket to Safety quest. Access the system through the console inside Scott Outpost's interior big tent, left of the entrance.
Two modes define the experience: Lost Void (License Level cap 200) and Withered Domain (cap 90). Each features unique rewards, progression systems, and difficulty scaling. Investigation License caps at level 60, governing overall progression.
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Bounty Commission Mechanics
Bounty Commissions require 300 Pressure reduction on Edge difficulty or higher for rewards. Pressure operates on 100-point thresholds—each 100 points increases Corruption by one level. Five Corruption levels trigger team HP loss.
Weekly bounties refresh automatically with two manual modifications permitted. First-clear rewards provide 80 Polychrome bonus.
Hollow Zero Rewards
Lost Void:
3,200 Polychrome total
2,000,000 Denny
24,000 Inter-Knot Credit
80 Boopon, 40 Victoria Housekeeping Coupon
18 Ether Electrolyte, 12 Energy Transfer Fluid, 74 Concentrated Cooling Fluid
Withered Domain:
1,440 Polychrome
900,000 Denny
10,800 Inter-Knot Credit
36 Boopon
18 Ether Electrolyte, 30 Concentrated Cooling Fluid
Daily tasks add 20 Polychrome, 2 Bangboo Algorithm Modules, 1,000 Denny per run. White Star Allowance contributes 80 Polychrome weekly.
Time-Limited Bounty Events: December 2025
Advanced Bounty Area Patrol (December 11-16, 2025) offers double drop rates across 11 stages at Scott Outpost. Requires Inter-Knot Level 8, permits two daily completions at 240 stamina per run. Two manual refreshes weekly enable strategic material targeting.
Stage 1 (Monster/Weirdo) drops Swing Jazz and Chaotic Metal with Special Attack DMG +100% and EX Special +100% buffs. Stage 2 (Fist/Gun) provides Hormone Punk and Fanged Metal. Challenge levels scale 30-60 in 10-level increments.
Data Bounty Combat Simulation
Runs December 24-29, 2025. Five Enemy Cards daily at HIA Club with doubled materials. Unlocks Season 1 Chapter 1 after Inter-Knot Level 8.
Doubled rewards make this critical for pre-2.5 stockpiling. Prioritize Enemy Cards matching your main DPS agents' material requirements.
Optimal Polychrome Farming Routes
Maximize acquisition through systematic progression in both modes while maintaining weekly bounty completion.
Daily rotation:
Complete daily Hollow Zero tasks (20 Polychrome + materials)
Progress Lost Void License Levels toward 200
Clear Withered Domain stages (1,440 Polychrome total)
Execute weekly bounty commissions (160 Polychrome/week)
Claim White Star Allowance (80 weekly Polychrome)
This generates 960 Polychrome from bounties over six weeks, supplementing 4,640 from mode completion. Total pre-2.5 acquisition exceeds 5,700 from Hollow Zero alone.
Energy Management
Advanced Bounty's 240 stamina per run demands careful allocation. Two daily completions consume 480 stamina during December 11-16.
Doubled drop rates create efficiency gains. Standard farming requires ~720 stamina for equivalent yields—240 stamina net savings daily. Over six days, this equals 1,440 stamina (six additional domain runs).
Reserve stamina items 48 hours before Advanced Bounty events for maximum participation without premium refreshes.
Combat Configuration and Resonium Systems
Combat Configuration grants +20 ATK per Withered Crystal collected, with specialized bonuses like +4% Ice DMG per crystal. Strategic collection impacts clear speed and survival on higher Corruption levels.
Resonium system requires four identical Resonia for basic reactions, eight for advanced. These provide substantial temporary buffs enabling undergeared teams to clear harder content. Prioritize Resonia matching your primary DPS element.
Bangboo Plug-In activation (hold R) provides emergency utility. Combat-focused Bangboo amplify damage; exploration variants offer mobility and resource detection.
Pressure Management
Keep Pressure below 500 to prevent excessive Corruption while maximizing rewards. Each 100 Pressure increases Corruption by one; five levels trigger HP loss.
Strategies:
Select lower-risk paths approaching 400 Pressure
Prioritize Pressure-reducing events over rewards
Utilize Bangboo Pressure mitigation abilities
Time high-risk encounters during low Pressure windows
Reset runs exceeding 450 Pressure unless you have overwhelming power. Resource investment rarely justifies marginal reward increases versus fresh run efficiency.
Team Composition for Bounty Efficiency
Balance clear speed, survivability, and energy efficiency. DPS-focused compositions eliminate waves quickly, reducing run time and Pressure. Stun-oriented teams enable burst windows against elites and bosses.
For Advanced Bounty Stage 1's Special Attack DMG +100% buff, feature agents with powerful Special Attacks and EX Special capabilities. This buff doubles damage output, enabling undergeared teams to clear above their power level.
Budget compositions using free story agents remain viable through License Level 150, though higher difficulties demand optimized builds and elemental coverage.
Support and Stun Integration
Support characters providing ATK buffs, damage amplification, or shields extend survivability during high-Corruption runs. Stun specialists enable consistent interrupts, preventing dangerous patterns and reducing incoming damage.
Coordinate Stun application with DPS burst windows for maximum damage-per-second efficiency. Shield-generating supports prove valuable during Corruption 4-5 where HP loss activates, absorbing environmental damage.
Pre-2.5 Polychrome Stockpiling
Version 2.5 timing remains unconfirmed—community speculation suggests late January to early February 2025. Maximize Polychrome during December 2025 time-limited events for anticipated limited banners.
One limited S-Rank requires ~14,400 Polychrome (90 pulls) with average luck. Guaranteed acquisition needs 23,040 Polychrome (144 pulls) for hard pity.
Prioritize guaranteed Polychrome sources over RNG content. Hollow Zero progression, weekly bounties, and time-limited events provide predictable income for accurate projections.
Resource Allocation
Prioritize Polychrome over material farming two weeks before anticipated banners. This ensures maximum pulling capacity while accepting temporary upgrade delays.
Resume material farming after securing desired agents, utilizing accumulated resources for immediate power spikes.
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Advanced Optimization Techniques
Lost Void and Withered Domain provide identical 16 Polychrome per level base rates. However, Lost Void's higher difficulty and longer clears reduce efficiency for undergeared players. Switch to Withered Domain if Lost Void runs exceed 15 minutes per level.
Speed-running techniques:
Memorize optimal paths minimizing backtracking
Skip low-value encounters when Pressure approaches thresholds
Use movement abilities for faster traversal
Pre-plan Resonium collection routes for maximum buff uptime
Benchmark clear times: 8-12 minutes per Lost Void level at License 150+, 5-8 minutes per Withered Domain level at License 60+. Significantly exceeding these requires reassessing team composition, equipment, or execution.
Combining Bounties with Daily Commissions
Integrate Hollow Zero bounties with commission completion, minimizing playtime while maximizing rewards. Commissions requiring specific eliminations often overlap with bounty paths, enabling simultaneous completion.
Identify commission objectives achievable within Hollow Zero runs. This reduces redundant travel and combat, improving progression efficiency.
Maintain flexible schedules for time-limited events. Advanced Bounty's December 11-16 window demands prioritization over standard routines.
Common Farming Mistakes
Don't assume all bounties provide equivalent returns. Lost Void's 3,200 Polychrome significantly exceeds Withered Domain's 1,440—prioritize Lost Void if you can clear it.
Calculate Polychrome-per-stamina ratios for available content. Time-limited events with doubled rewards almost universally provide superior returns versus permanent content.
Don't ignore Vanguard rank progression. Consistent weekly bounty completion increases rank, unlocking improved rewards that compound over time.
Time Management During Limited Events
December 2025 features overlapping events requiring advance planning. Reserve stamina items for event windows, avoiding consumption during standard farming.
Calendar planning should account for real-world conflicts. Missing one day of doubled-reward events represents significant unrecoverable opportunity cost.
Bounty Farming Versus Alternative Sources
Story missions provide substantial one-time Polychrome but lack sustainability. Hollow Zero offers renewable weekly income through commissions and License progression.
Event rewards vary: combat events typically provide 300-600 Polychrome, exploration events 400-800. These supplement but don't replace consistent bounty farming.
Weekly bounty completion generates 8,320 Polychrome annually (52 pulls)—substantial value for minimal time investment.
Daily Routine Integration
Allocate 30-45 minutes for Hollow Zero content, balancing efficiency with sustainable playtime. This accommodates 2-3 License Level completions plus daily tasks.
With limited playtime, prioritize weekly bounties and time-limited events over License grinding. Missing weekly bounties sacrifices guaranteed Polychrome; License progression remains available indefinitely.
Establish realistic daily goals matching available playtime to prevent burnout.
FAQ
How much Polychrome do Hollow Zero bounties provide total?
3,200 from Lost Void, 1,440 from Withered Domain, 960 from six weeks of commissions, 80 from first clears, 80 weekly from White Star Allowance, plus 20 daily from tasks. Total exceeds 5,700 Polychrome.
When do Advanced Bounty Area Patrol and Data Bounty events run?
Advanced Bounty: December 11-16, 2025 (double drops, 240 stamina/run). Data Bounty: December 24-29, 2025 (five Enemy Cards daily, doubled materials).
What are Hollow Zero unlock requirements?
Unlocks during Art of War Lite Edition in Chapter 1 Intermission after Earlybird Ticket to Safety quest. Inter-Knot Level 8 required for Advanced Bounty and Data Bounty participation.
How does Pressure affect bounty rewards?
Each 100 Pressure increases Corruption by one level. Five levels trigger HP loss. Bounty Commissions require 300 Pressure reduction on Edge difficulty or higher for rewards.
Which mode should I prioritize for Polychrome?
Lost Void (3,200 Polychrome) over Withered Domain (1,440). But Withered Domain offers faster clears for undergeared players, potentially better Polychrome-per-minute efficiency depending on team power.
How do I maximize time-limited event efficiency?
Reserve stamina items for events, prioritize event participation over standard farming, plan schedules around availability. Advanced Bounty needs 240 stamina/run; Data Bounty's five-card daily limit requires consistent participation for maximum materials.