Hollow Zero Guide and Overview in Zenless Zone Zero

As you play through Hollow Zero's various game modes, they will each feature special equipment that enhances your gameplay in some way. For example, investigating through the Withered Domain and Lost Void can reward you with various Resonia, which are "Ether matter polymers."

For a basic overview of what Resonia are, consult the Resonium guide below. For other types of Equipment, such as Lost Void's Gear or Inferno Reap's Resonium Kits, consult the guide for the game mode that features them.

After players have unlocked the Agent Trust system in Zenless Zone Zero, Affinity Resonium will also be obtainable for use within Hollow Zero. Whenever players encounter an Affinity event within a Hollow Zero run, they will receive a Resonium that temporarily gives a Mindscape Cinema Effect for the Agent to use. You can only use Affinity Resonium for an Agent you have a Trust Level of Close with, as well as an Agent who is currently in the Hollow Zero squad.

To unlock Affinity Resonium, players need to fulfill the following conditions first:

• Obtained the Agent (through Signal Searching or Events)
• Increased the Agent's Trust to Close
• Complete the Promotion Event to Receive Rewards

Players can begin building an Agent's Trust after completing the corresponding Agent's Main Story Commission or Agent Story. Afterwards, they can either send a Trust Invitation to the Agent and schedule a Trust commission, or interact with the Agent in a Trust Event randomly around New Eridu. The rewards, including Affinity Resonium, can be received through the Knock-Knock DMs menu, or through the Partner Archive at Random Play's Workbench.

While it is not necessary to increase an Agent's Trust in order to complete Hollow Zero, it can provide useful bonuses for your squad when challenging the harder difficulties, especially for Agents you primarily play with.

In the Hollow Zero Depths Investigation, players can complete White Star Institute Allowance quests in order to receive rewards such as Polychromes, Dennies, and Bangboo Upgrade Materials. Usually, these quests are unique to their respective game mode and cannot be completed elsewhere.

To view them, players can consult the Reward button in the bottom-left of the Exploration Collection or Ray's Research Log. For quests unique to specific stages, such as Inferno Reap or Battlefront Purge, you can access them through their respective stage menus.

For Main Menu Achievements under the Tactics category, it categorizes Hollow Zero achievements under Lost Void and Withered Domain. These achievements are a little different from the ones you can view within the game mode: they primarily provide only Polychromes, with more rare or difficult achievements rewarding special titles.

While players are exploring the Depths Investigation in Hollow Zero, they may encounter Events that are recurring, new, or exclusive to Hollow Zero. To review what each Hollow Event does, players can access the Hollow Codex, which categories each Event into the following types:

• Mark
• Environment
• Device
• Resource
• Threat
• Encounter
• Hollow Visitor
• Hollow Zero

The Hollow Codex will not list Events that the player has not encountered yet. Within Hollow Zero, you may encounter Events from several categories, but only the Hollow Zero Events are exclusive to the game mode.

Players can access the Hollow Codex through the Workbench inside the Staff Room at Random Play.

If players speak with Ray inside the Tent at Scott Outpost, she will present her Research Log, which is a record of data found in Hollow Zero's various game modes.

In Withered Domain, if players encounter a Hollow Zero Event: Weird Detective, they may receive valuable recordings known as Lost Items from the Old Capital. These Lost Items provide additional lore information about Hollow Zero. To learn more about where to find specific Lost Items, players can review the Unlock Condition through this tab within Ray's Research Log.

In Lost Void, players can obtain Unofficial Guide Primers by completing certain achievements in Battlefront Purge at Difficulties V and higher. You cannot obtain them through completing Task Force Investigations.

As players complete more challenges in Hollow Zero, they may help Ray complete her Research Log for additional rewards. These rewards include Polychromes, Dennies, and Bangboo Algorithm Modules. As well, for completing certain amounts of Research primers for Ray, players will receive a Polychrome allowance from the White Star Institute.

While players explore Hollow Zero, they may receive a currency known as Z-Merits. These can also be obtained from completing special commissions. Z-Merits can be used to exchange for valuable items at the Logisitics Shop from Casper at the Scott Outpost. These valuable items include Master Tapes, Boopons, Upgrade Materials, and Dennies. The shop resets its stock on the 1st of every month, so make sure to exchange the items in time. Casper can be found outside the tent near the Hollow Zero system, or at the Logistics Shop location within the Travel shortcut menu.