I've been tracking the Zenless Zone Zero 2nd Anniversary campaign closely, and the headline for me is not just the free 40 pulls or the Limited S Rank Selector from the celebration track. It is the extra Top Up campaign that runs for the entire 2nd Anniversary Update Patch and adds two more high-value selector milestones. The way it works is simple on paper: every purchase of top-up packs, monthly passes, Battle Passes, or other in-game shop items generates a proportional amount of Commemorative Ticket Stubs. Once I accumulate enough stubs and hit specific thresholds, I can claim milestone rewards, including a free S Rank W-Engine Selector and a Limited S Rank Agent Selector. I want to be clear that this is a spending milestone track, not a free login event, so the value depends on whether I was already planning to spend during the patch.

The milestone math is the part I would underline. The Limited S Rank W-Engine Selector arrives at the 7,000 mark, while the Limited S Rank Agent Selector arrives at the 10,000 mark. Both selectors are tied to the same three-agent pool, and each choice comes with that agent's signature W-Engine option. The three options are Astra Yao, Vivian, and Seed. That makes the 10,000 milestone the real decision point for me, because an Agent Selector is usually more account-defining than a W-Engine Selector, especially when the pool includes one of the game's best universal supports.

Milestone	Reward	My priority
7,000	Limited S Rank W-Engine Selector	Astra Yao's signature engine if I already have her
10,000	Limited S Rank Agent Selector	Astra Yao first, then Seed or Vivian based on account needs

🎯 Astra Yao is the default pick for most accounts

Astra Yao is an S Rank Ether Support Agent, and I would call her the most valuable option in this selector. Her kit provides a massive amount of damage amplification, and her playstyle is remarkably easy to execute. I activate her Idyllic Cadenza state with either her EX Special Attack or her Ultimate, then switch into my DPS character through her Quick Assist. While Idyllic Cadenza is active, she gives the team a strong damage and critical damage buff, adds off-field damage, and can even heal allies with her Ultimate. That combination makes her one of the most versatile support characters in the game.

My pick rating for Astra Yao is 10/10. She fits into many different teams, and her buffs are not tied to a narrow element or specialty. If I did not have Astra Yao on my account, I would not overthink this selector. She would be my first choice.

⚠️ Vivian is good, but she is more replaceable

Vivian is an S Rank Ether Anomaly Agent who specializes in inflicting Abloom damage while she is off-field. Her rotation is quick: she uses normal attacks or her EX Special Attack to gain special feather stacks, with a maximum of five active at once. When an ally inflicts an Attribute Anomaly effect on an enemy, Vivian launches a coordinated attack, deals Ether damage, and inflicts Abloom while consuming her feather stacks. That makes her a decent off-field Anomaly enabler.

My pick rating for Vivian is 7/10. The problem is sustain. Most Anomaly teams trigger multiple Attribute Anomaly effects quickly, so Vivian can burn through her feather stacks very fast. That makes it hard to keep her off-field damage consistent. Since her release, several powerful Anomaly Agents have also arrived and do her job better. I would only pick Vivian if my account lacks good Anomaly Agents.

⚡ Seed is a solid Electric DPS, but not a must-pick

Seed is an S Rank Electric Attack Agent who excels at dealing powerful EX Special Attack Electric damage. She works as a main or sub DPS for Electric teams. Her kit focuses on gaining EX Special Energy whenever other allies trigger their EX Special Attacks, which lets her recover and conserve her own gauge. Once she has enough energy, she switches in and bombards enemies with projectiles and missiles, raising her Core Skill gauge. When that gauge is full, she unleashes a wide-area Electric attack.

My pick rating for Seed is 7/10. Her gameplan is pure damage, and she does it well enough. The issue is uptime. Her damage window is short, and other Electric DPS options can outperform or replace her. I would have a hard time justifying Seed unless I already had Astra Yao and Vivian, or unless my account specifically needed an Electric DPS.

🔧 The W-Engine selector adds real value

Astra Yao's signature support W-Engine is one of the strongest in the game. When any squad member enters through a Quick Assist, Chain Attack, Defensive Assist, or Evasive Assist, the equipper gains 5 Energy, once every 5 seconds. When the equipper consumes 25 or more Energy, all squad members deal 10% more damage, stacking up to two times and lasting 20 seconds. Repeated triggers reset the duration, and only one instance can exist in a squad. My rating is 10/10 for Astra Yao and 9/10 for other support agents. It gives Astra Yao the Attack stat she wants, improves her energy gain, and boosts team damage.

Vivian's signature W-Engine increases Anomaly Buildup Rate by 40%. When the equipper deals Ether damage, their Anomaly Proficiency increases by 20 for 5 seconds, stacking up to six times. It can trigger once every 0.5 seconds, and repeated triggers reset the duration. My rating is 10/10 for Vivian and 5/10 for others. For Vivian, it provides important Anomaly stats as long as she keeps dealing Ether damage. For other agents, it is mostly a stat stick.

Seed's signature W-Engine increases CRIT Rate by 15%. When the equipper deals damage with a Basic Attack or EX Special Attack, they gain one stack of a buff. Each stack increases Electric DMG by 12.5%, up to two stacks, and each stack lasts 40 seconds with separate durations. It can trigger once per skill use. At two stacks, Basic Attack and Ultimate damage ignore 20% of enemy DEF. My rating is 10/10 for Seed and 8/10 for others. It is a strong, fairly universal option for Electric Attack agents.

💡 My final selector plan

If I were choosing from this Top Up selector, my order would be Astra Yao first, Seed second if I needed Electric damage, and Vivian third if I needed an Anomaly enabler. Astra Yao's 10/10 rating is not hype; her support value is broad, her buffs are easy to maintain, and her healing gives her extra staying power. I would treat the 10,000 milestone as the real prize and the 7,000 W-Engine milestone as a bonus for accounts that already have the right agent. The 2nd Anniversary celebration campaigns are generous on their own, but I would still plan my spending around the selector I actually need rather than chasing the milestone ladder blindly.