Mastering Promeia and Starlight-Billy in Zenless Zone Zero Version 2.8

In Zenless Zone Zero Version 2.8, "Sunset of New Eridu" shifts the meta with the arrival of Promeia and the high-mobility Starlight-Billy. To succeed, players must pivot their resource allocation toward these new agents while mastering the advanced combat mechanics required to navigate the game’s increasingly difficult endgame encounters. This guide provides the strategic framework for integrating these units into your roster, maximizing your efficiency in the new narrative arc.

Strategic Resource Allocation for Promeia

Promeia’s introduction is designed to disrupt current team-building patterns, particularly for players relying on standard elemental synergy. Her kit introduces unique utility that, if leveraged correctly, elevates your team’s damage ceiling significantly.

• Pre-Patch Farming: Focus your Battery Charge on ascension materials and skill chips before the patch drops. Having these ready allows for "day-one" maxing of her core passives, which is essential for tackle-heavy content.
• Avoid Resource Dilution: Do not spread your materials across multiple secondary agents. Funnel your primary investment into Promeia’s level, skill upgrades, and W-Engine levels.
• Synergy Analysis: Evaluate your current roster. If your existing squad lacks high-impact anomaly application or specific support multipliers, Promeia is likely your priority. Her ability to modify chain attack sequences makes her an ideal candidate for teams looking to break enemy toughness meters faster.

Mastering Starlight-Billy Combat Dynamics

Starlight-Billy is not just a cosmetic variant; he is a mechanical shift for the Billy Kid archetype. He rewards players who prioritize positioning over raw damage output.

• High-Mobility Playstyle: Unlike standard iterations, Starlight-Billy excels in hit-and-run scenarios. His kit is built around high-mobility dashes that transition into burst windows. You must master the precise dodge window for every boss encounter to keep his damage multiplier active.
• W-Engine Selection: Because his damage profile is specialized, prioritize W-Engines that boost physical damage or critical hit performance during movement. If you lack his signature W-Engine, seek out stat-stick alternatives that prioritize basic attack bonuses, as these will maintain your damage floor.
• Practice Drills: Spend time in the HIA training room with current ranged units to sharpen your reaction timing. Training your muscle memory to identify enemy telegraphs before they finish their animation is the difference between a successful run and a failed challenge.

Navigating the "Sunset of New Eridu" Narrative

The content in "Sunset of New Eridu" features environmental hazards and enemy resistances that punish static or brute-force team compositions. To progress, you must adopt a more tactical approach to team building.

• Elemental Resistance Checks: Expect high-difficulty missions where enemies are resistant to common elements. Use the pre-mission lobby to inspect enemy traits. If a stage demands specific elemental coverage, rotate your team composition to match those weaknesses rather than forcing your "main" squad.
• Event-Driven Progression: Participate in the limited-time events tied to the 2.8 update immediately. These events are specifically tuned to help players bridge the power gap between their current gear and the new enemy scaling. Use the currencies gained from these events to finish off your leveling requirements for Promeia or Starlight-Billy.
• Retreating and Resetting: In more difficult Labyrinth or Siege encounters, do not fear the retreat button. If you find your current duo-team strategy falling short, use the pause menu to reassess your W-Engine setups or switch out a support agent before attempting the encounter again.

Decision Making: Trade-offs and Priorities

For free-to-play (F2P) and low-spending players, the decision to pull for both agents simultaneously is rarely optimal. You must weigh the utility of each against the gaps in your existing account.

Strategic Recommendations:

1. Prioritize the Agent over the Weapon: If your Polychrome stash is low, prioritize pulling the agent. In Zenless Zone Zero, having a wider roster of specialized agents often provides more value than a single character with their signature weapon.
2. The "One-at-a-Time" Rule: Build one agent to full viability before starting the next. An account with one fully optimized, endgame-ready character is infinitely more valuable than an account with two under-leveled, poorly equipped agents.
3. Evaluate Your Needs: If you struggle to clear content within the time limit, pull for Starlight-Billy. If you struggle to survive or maintain pressure during boss phases, prioritize Promeia.

Common Mistakes to Avoid

• Ignoring Passive Synergies: Many players pull new agents and immediately force them into their existing teams without checking if their passives actually activate. Always read the character’s "Core Passive" requirements to ensure your team composition triggers their full potential.
• Wasting Battery Charges: Do not spend your daily energy on materials you don't immediately need. Focus only on the resources required to ascend your current target agent to the next breakpoint.
• Neglecting Dodge Timing: Zenless Zone Zero combat is rhythm-based. If you try to play Starlight-Billy like a stationary turret, you will lose uptime. Prioritize learning the "perfect dodge" mechanics over maximizing your attack speed.

By following these strategies—prioritizing resource allocation, mastering mobility, and making informed pulling decisions—you will successfully navigate the challenges of the "Sunset of New Eridu" and ensure your team remains at the forefront of the meta.