Version 3.1 New Eridu City Fund: Rewards & Guide

The New Eridu City Fund makes its return in Zenless Zone Zero Version 3.1, delivering a classic battle pass format filled with fresh goodies for proxies. Whether you prefer playing completely free-to-play or are eyeing the paid tiers, knowing what each level offers is crucial for optimizing your Polychrome earnings and enhancement resources. For comprehensive updates covering every ZZZ event, browse our Zenless Zone Zero news on GenshinBuilds.

At a Glance

• Event Schedule: Begins with the Version 3.1 patch and runs until 2026-09-07 at 03:59 (server time). Sales shut down slightly earlier at 2026-09-07 02:59.
• Prerequisites: Reach and unlock Combat Simulation during Chapter 1 (“Cat’s Lost & Found”).
• Basic Plan: Free by default; accumulate Fund Level XP by knocking out Expansion Tasks.
• Growth Plan: Priced at 680 Polychrome, granting 680 Polychrome back instantly alongside the “Berry Party” avatar.
• Premium Plan: Includes an extra 208 Polychrome, menu decorations, W-Engine Microcontroller Units, Resonating Cores, and Ether Batteries.
• City Fund Level 30 Milestone: Reaching this threshold on any paid track awards the temporary Great Builder’s Certificate, which expires when the season ends.

Schedule & Important Deadlines

The Version 3.1 New Eridu City Fund is active right from the update launch up until 2026-09-07 at 03:59 server time. Keep in mind that purchases for the Growth Plan, Premium Plan, and Tier Upgrades wrap up two hours prior at 2026-09-07 02:59. Once sales close, you can still finish up remaining Expansion Tasks to collect any uncollected progress rewards until the timer runs out.

Reward Tier Breakdown

Basic Plan (Free-to-Play)

Available automatically to every proxy. Tackling daily and weekly Expansion Tasks rewards you with progression experience to unlock standard items, Denny, and essential upgrade commodities at no cost.

Growth Plan

Requiring an investment of 680 Polychrome (or local currency equivalent), this tier provides immediate perks:- Polychrome ×680 credited straight away- The exclusive “Berry Party” avatar

As you climb through the fund tiers on this path, you’ll also secure the “Time for Afternoon Tea” namecard, W-Engine Microcontroller Units, Resonating Cores, Hamster Cage Passes, and custom material caches.

Premium Plan

Proxies who have already secured the Growth Plan can utilize the Plan Upgrade to move up to the Premium Plan. This bundles:- Polychrome ×208 upfront- A unique menu decoration set– W-Engine Microcontroller Unit items- Resonating Core materials- Ether Batteries

Furthermore, this tier unlocks all the level-based progression rewards found in the Growth Plan, boosted with higher quantities and extra loot drops.

Note: The Great Builder’s Certificate unlocked at Fund Level 30 is strictly time-sensitive and will not carry over into subsequent City Fund seasons. Make sure to spend it before the period concludes.

F2P vs Paid Value Analysis

For strict free-to-play users, the Basic Plan provides reliable foundational value. Diligently clearing out Expansion Tasks lets you farm materials and accumulate minor Polychrome stashes without spending a dime.

Low spenders and budget players will find strong efficiency in the Growth Plan. Since it refunds your 680 Polychrome instantly, the avatar and tier rewards essentially pay for themselves. Meanwhile, the Premium Plan layers on an extra 208 Polychrome and rare resources, making it a great pickup for anyone who regularly buys in-game packs.

Hardcore investors and whales will likely grab the Premium Plan right away to speed up agent and engine development via extra W-Engine Microcontroller Units and Hamster Cage Passes.

Is It Worth Buying?

The New Eridu City Fund remains one of the most reliable methods for turning Polychrome into long-term account progression. Regular ZZZ players will find that the time invested into these levels yields resources that would otherwise drain significant energy reserves. While cosmetic items like the avatar and namecard are nice bonuses, the inclusion of rare W-Engine Microcontroller Units and Resonating Cores cements the paid tracks as worthy investments for roster builders.

Final Thoughts

Make sure to note the purchase cutoff on 2026-09-07 at 02:59. Optimize your Expansion Task routine so you don’t miss out on grabbing the Great Builder’s Certificate. For deeper insights, character rundowns, and banner schedules, check out our other guides on GenshinBuilds.