Zenless Zone Zero – Hollow Zero Event Guide

Hollow Zero Event Compendium

By Kyntelle.

Many nodes offer different outcomes depending on your [Research] Resonium. Your Research Resonium is assigned automatically for Old Capital Metro, Construction Ruins, and Abandoned Skyscraper, while in Withering Garden you can select one of the three freely.

Activated Crystal

Three of the following will appear.

1. Process highly-active crystals: Catalyze up to 10 Resonia. Gain the Corruption “Metabolic Trauma: You can no longer recover HP”.
2. Craft it into combat supplies: Obtain 6 Resonia. Gain the Corruption “Metabolic Trauma: You can no longer recover HP”.
3. Craft it into restorative medicine: Restore all HP. Gain the Corruption “Gear Allergy: You can no longer obtain Gear Coins”.
4. Craft it into something that soothes your nerves: Remove all Corruptions. Gain the Corruption “Delirium: Significantly increases gained Pressure” (Pressure +200%).

Ambush?

1. Fine, I’ll buy them: Lose all Gear Coins and gain one S-Rank Resonium.
2. Don’t underestimate me!: Reduce a random squad member’s HP to 1. Gain 2 S-Rank Resonia.
3. Launch a surprise attack!: Lose 0-40% of max HP. Gain 1,000-2,000 Gear Coins.
4. Turn and run: Lose 10% HP.
5. “Please leave it to me.”: (Have a Victoria Housekeeping agent in squad) Replaces option 4. Obtain 1 S-Rank Resonium.

Busy Rest Area

1. Gather info via osmosis: Randomly proceed to one of the following.
   • Assist the Wounded
     • Assist the ones with the most severe wounds.: Gain 100 Pressure and gain an S-Rank [Hollow] Resonium.
     • Assist the ones with less severe wounds.: Gain 50 Pressure and gain an A-Rank [Hollow] Resonium.
     • Leave: Exit encounter.
   • Exchanging Supplies
     • Large Transactions: Spend 1500 Gear Coins and gain an S-Rank [Hollow] Resonium.
     • Moderate Spending: Spend 800 Gear Coins and gain an A-Rank [Hollow] Resonium.
     • Leave: Exit encounter.
   • Paid Experimentation
     • Offer a generous amount of blood: Lose 30% of HP and gain an S-Rank [Hollow] Resonium.
     • Offer a small amount of blood as a sample: Lose 15% of HP and gain an A-Rank [Hollow] Resonium.
     • Leave: Exit encounter.
2. Talk with the other Independent Investigators: Gain 50 Pressure and switch your Collection Specialty Resonium.
3. Do business with the Bangboo merchant: Spend 500 Gear Coins and switch your Collection Specialty Resonium.
4. Donate blood to help the medical team: Lose 15% HP and switch your Collection Specialty Resonium.

Defense Force Logistics Hub

1. Make a fair trade: Lose 7 Resonia. Obtain all the Resonia of one type.
2. Compliment them passionately and try and talk them into giving you some supplies: Gain 3 random Resonia.
3. Take a wee break: Remove 1 Corruption. Restore 30% of max HP for all squad members.
4. Buy a “Powerful” Resonium: Select each option a maximum of one time.
   • Buy advanced supplies: Spend 2000 Gear Coins. Gain 3 A-Rank Resonia.
   • Buy rare supplies: Spend 1000 Gear Coins. Gain 1 S-Rank Resonia.
   • I’ll pass.: Exit encounter.

Dilapidated House

Select repeatedly until exiting encounter:

1. Use force in your “visit”: Gain 600 Gear Coins. Can be selected up to 5 times.
2. Leave through the collapsed portion: Exit encounter. Lose HP equal to 10% * number of times option 1 was selected.
3. Leave through the crack: (Use force at least once) Exit encounter. Gain 1 Corruption. 
4. Slip into the crack: (Have Lucy, Piper, Seth, Soukaku, or ??? in the squad) Gain 1400 Gear Coins.
5. Destroy the dangerous building: Gain ? (230-730) Gear Coins. Chance to obtain 1 Bangboo Plug-In. Exit encounter.
6. Look for survivors:
   • Give 1 Concentrated Medicine: ???
   • Give 1 Concentrated Medicine II: Gain 2 rare Bangboo Plug-Ins.
   • Give 1 Integrated Supply or Integrated Supply II: ???
   • Just leave: Exit encounter.

Distress Signal

1. Analyze the source of the signal: Spend 500 Gear Coins and randomly proceed to one of the following.
   • Bandit ambush
     • Give them a taste of their own medicine: Gain 3 Resonia.
     • [Section 6 exclusive option]: (Have a member of Section 6 in your squad) Gain ? Resonia.
   • Trapped people:
     • Donate some resources: Lose 100 Gear Coins. Remove 1 Corruption.
     • Accept the gift and pay the price: Pressure +60. Gain 2 Resonia./Pressure +30. Gain 800-1200 Gear Coins.
     • Sorry, next time, I promise: Exit encounter.
2. Enter the area: Randomly proceed to one of the following.
   • Bandit ambush: Enter combat.
   • Trapped people:
     • Donate some resources: Lose 100 Gear Coins. Remove 1 Corruption.
     • Accept the gift and pay the price: Pressure +60. Gain 2 Resonia./Pressure +30. Gain 800-1200 Gear Coins.
     • Sorry, next time, I promise: Exit encounter.
3. Ignore the signal: Exit the encounter.

Elite Bangboo Assistant

1. Gain Basic Supply Pack/Ace Necessities Pack/Super Bonus Pack: Receive a random B/A/S-rank Resonium respectively. Begins at Basic and upgrades each time option 2 is selected.
2. Upgrade purchasable supply packs: Spend 300 Gear Coins up to two times to upgrade the Resonium received from the first option to the next rarity tier. Return to selection.
3. I’m Phaethon! Gimme gimme!: Gain 50 Pressure. Gain 0-3 Resonia.
4. “I want the most deluxe one!”: (Upgrade purchasable supply packs two times) Spend 2000 Gear Coins to upgrade again and receive two S-Rank Resonia.
5. Ask about the special service: Lose 20% HP. Double your current count of Concentrated Medicines.
6. Let Grace handle it.: (Have Grace in squad) Double Resonia obtained from selecting option 1. Return to selection.

Emergency Evacuation Point

1. Let squad member 1 rest: Squad member 1 leaves. Obtain 3 Resonia/2500 Gear Coins.
2. Let squad member 2 rest: Squad member 2 leaves. Obtain 3 Resonia/2500 Gear Coins.
3. Let squad member 3 rest: Squad member 3 leaves. Obtain 3 Resonia/2500 Gear Coins.
4. You don’t have to push the button: Exit encounter.
5. (Have Ellen in squad) Obtain 3 Resonia/2500 Gear Coins.

Fissure!

1. Lost property: Lose 2 random Resonia.
2. Face your fear: Set Pressure to 90.
3. Accidental injury: Reduce one character’s HP by 50%.
4. Fight the enemies in the abyss:
   • Step into the abyss: Set all characters’ HP to 5% and enter combat. If successful, restore HP to 60% and gain two catalyzed Resonia.
   • Maybe next time: Return to previous selection.
5. Throw all your Gear Coins in: Replaces option 4. Obtain ? Resonia and ? Bangboo Plug-Ins.

HSO Task Force

1. Obtain combat supplies: Obtain a B-Rank Resonium of the specified type.
2. Do you have anything else?: Change the Resonium type in option 1 up to 3 times.
3. More Gear Coins needed: Obtain ? (937-1038) Gear Coins.

Manual Vending Machine

1. Insert coins as usual: Lose 500 Gear Coins and obtain one common Bangboo Plug-In.
2. Insert a huge amount of coins: Lose 1000 Gear Coins and obtain one rare Bangboo Plug-In.
3. Intimidate the vending machine: Gain 50 Pressure and obtain two rare Bangboo Plug-Ins.
4. Crack open the vending machine: (Have Ben, Caesar, or Lycaon in squad) Obtain one rare Bangboo Plug-In.

Medicine Information Leaflet

1. Use a little bit: Pressure +100 up to 3 times. If selected three times, obtain 4 Resonia.
2. Read the article: Gear Coins +100% for the remainder of the run.
3. Use a little bit: Pressure +15.
   • Use just a little bit more: Pressure +30.
     • Use just a little bit more: Pressure +60. Gain 1 Resonium.
     • Don’t use: Exit encounter.
   • Don’t use it: Exit encounter.
4. Use them all: Lose 40% HP. Remove 2 Corruptions and clear all Pressure.
5. Don’t use it/Don’t use: Exit encounter.

Paid Rest Area

1. Enjoy the service without paying: Pressure +20.
2. Select the cheapest service: Spend 500 Gear Coins.
3. Select a luxury service: Spend 1000 Gear Coins. Pressure -100. Remove one Corruption.
4. “The deluxe service – my treat!: (Have Nicole in the squad) Replaces option 1. Pressure -20.

Public Security Reserve Force

1. Hooray! What a windfall!: Obtain 2 Resonia. Pressure +100.
2. With risk comes reward!: Sustain 1 Corruption. Obtain 2 Resonia and a Bangboo Plug-In.
3. Only if the supplies are absolutely safe: Obtain 2 [Hollow] Resonia.
4. I want supplies to boost my combat abilities…: Lose 10% HP. Obtain one [Artifice] Resonium.
5. Thanks, but no thanks!: Exit encounter.
6. “I promise to use these supplies as wisely as possible.”: (Have Anby in the squad) Replaces option 3. Obtain one A-Rank or S-Rank Resonium.

Reckless Hollow Raider

An hidden alternate version of this event may appear where you receive the Lost Item From The Old Capital “Crudely-Crafted Hollow Zero Investigator’s ID” upon exiting the encounter.

1. Follow him and proceed: Select up to three times for 30%/40%/60% chance to enter combat. If combat is avoided, high chance to gain 200/300/500 Gear Coins. Encounter ends if combat is triggered.
2. “We need supplies to ease the symptoms of Corruption…”: Lose 20% HP. Remove one Corruption.
3. Play “Rock Paper Scissors”: Play Rock-Paper-Scissors until the Hollow Raider loses to you two times or until you leave. Each win grants 800 Gear Coins, and each loss deducts 400. If you lose and lack the Gear Coins to pay, the encounter ends.
   • Rock
   • Paper
   • Scissors
   • I quit: Exit encounter.
4. Feel for cracks:
   • Give it a try: Lose 5% HP. 40% chance to obtain 1 Resonium. If failed, return to selection up to two more times; HP loss increases by 5% and success chance increases by 30%.
   • Never mind: Exit encounter.
5. “I prefer to work alone.”: Exit encounter.

Resource Recycling Squad

Select from these options up to 5 times:

1. Buy a supply box!: Spend 200 Gear Coins.
2. Just steal a supply box!: Lose 5% HP.
3. Spend time pleading for a supply box: Gain 20 Pressure.

Each selection can result in one of the following outcomes:

• Pressure +30.
• Pressure -30.
• Gain 100 Gear Coins.
• Gain 362-388 Gear Coins. 
• Recover 10% HP.
• TBA
• Gain an S-Rank Resonium. (Only available on fifth trade, guaranteed)
• Gain 2000 Gear Coins. (Only available on fifth trade, guaranteed)

“Safe” Train Car

If on floor 1:

1. Give it an overhaul: Gain 50 Pressure. Catalyze 2 Resonia.
2. Just fix the gate: Gain 25 Pressure. Catalyze 1 Resonium.
3. Look for supplies aboard the “safe” train car: Obtain 1 Concentrated Medicine.
4. Take a break on the train: Lose 30 Pressure.

If on floor 2 or 3:

1. Give it an overhaul: Gain 100 Pressure. Catalyze 4 Resonia.
2. Do some simple repairs: Gain 50 Pressure. Catalyze 2 Resonia.
3. Look for supplies aboard the “safe” train car: Obtain 2-3 Concentrated Medicine.
4. Take a break on the train: Remove 1 Corruption.

Regardless of floor:

• Loot all the Gear Coins here: Gain ? (155-674) Gear Coins. Amount may increase with floor.

If on floor 3 and this node has been visited on both previous floors (conjecture), all of the above will be replaced with the following:

• Approach the “safe” train car:
  • Take the medical supply: Restore 30% of max HP.
  • Take the combat supply: Obtain 1 A-Rank Resonium.
  • Take the Sedatives: Remove 1 Corruption. Clear your Pressure.

Support Station

Before main selection, depending on agents, one or both of the following mutually exclusive options may appear:

• Send a Cunning Hares’ Agent to “negotiate”: (Have a Cunning Hares agent in squad) Increase maximum number of selections to five.
• Belobog Industries’ Agents are good at selecting supplies: (Have a Belobog Industries agent in squad) Increase selection success probabilities for options 1 and 3 to 50% and 70% respectively. Increase HP recovery for option 2 to 15%.

Afterwards, one of the following may be selected up to three times.

1. A very light supply box: 40% chance to obtain 1 Resonium. Failure results in Pressure +20.
2. A portable medical kit: Recover 10% HP.
3. A damaged Bangboo plug-in: 60% chance to obtain a Bangboo plug-in. Failure results in Pressure +20%.
4. No need: Exit encounter.
5. Exchange Claims for supplies: Replaces option 4. Gain Concentrated Medicines equal to number of remaining claims. Exit encounter.

White Star Institute Research Station

1. I want some combat supplies…: Obtain 2 [Hollow] Resonia.
2. Agree to the scholars’ research: (Have either Gear Coin or HP [Research] Resonia)
   • A long-term choice: Lose all your Gear Coins. Store prices -50% for the remainder of the run./HP set to 20%. HP recovery +100% (excluding combat) for the remainder of the run.
   • Living in the moment: Double your Gear Coins. Store prices +50% for the remainder of the run./HP set to 100%. HP recovery -50% (excluding combat) for the remainder of the run.
   • Nah.: Exit encounter.
3. Maybe ask for more?: Gain 70 Pressure. Reduced chance of receiving B-Rank Resonia for the remainder of the run.
4. Leave: Exit encounter.

Windfall Too Conspicuous

Make 1 selection from the following options.

Select repeatedly from options 1-3. Selection may repeat up to 6 times but can end early. If the encounter ends naturally, gain 1 Resonium.

1. Ask squad member 1: Lose 15% of squad member 1’s HP. Obtain 800-1400 Gear Coins.
2. Ask squad member 2: Lose 15% of squad member 2’s HP. Obtain 800-1400 Gear Coins.
3. Ask squad member 3: Lose 15% of squad member 3’s HP. Obtain 800-1400 Gear Coins.
4. Leave: Pressure +20. Exit encounter.
5. Look at Nicole: (Have Nicole in squad) Replaces option 4. Gain ? Gear Coins and exit encounter.

Veteran Investigator

1. Buy: Spend 400 Gear Coins. Obtain 1 Resonium.
2. Exchange: Lose one B-Rank Resonium. Obtain 1 Resonium.
3. “Slightly corrupted supplies will do just fine…”: Pressure +30. Obtain 1 A-Rank Resonium.
4. “I’ve got some supplies I can sell to you.”: Sell Resonia up to 2? times. After each sale, sale price decreases by 10%.
   • Sell an S-Rank Resonium: Lose 1 random S-Rank Resonium. Gain 2000 Gear Coins.
   • Sell an A-Rank Resonium: Lose 1 random A-Rank Resonium. Gain 1200 Gear Coins.
   • Sell a B-Rank Resonium: Lose 1 random B-Rank Resonium. Gain 800 Gear Coins.
   • I’ll hold onto it after all…: Exit encounter.
5. Buy Concentrated Medicine:
   • Buy one: Use 600 Gear Coins. Obtain 1 Concentrated Medicine.
   • Please give me one: Pressure +40. Obtain 1 Concentrated Medicine.
   • Leave: Exit encounter.
6. No thanks: Exit encounter.