InZenless Zone Zero, a key way to improve the strength of your ally agents is through W-Engines, which boost specific agents' skills and attacks. Some are broad buffs to a wide selection of agents, while others are designed entirely to favour one particular agent.

These agent-specific W-Engines are rarer to find, locked to A or S rarity pulls. One of these agent-specific W-Engines is the Fusion Compiler, which is the W-Engine designed for Grace Howard, the female engineer at Belobog Heavy Industries. It matches the name of her key weapon, and the buffs it provides heavily improve her combat abilities.

The Fusion Complier W-Engine in the Signal Shop of Zenless Zone Zero.

How To Get The Fusion Compiler

Getting this specific W-Engine is limited totwo optionsin ZZZ: throughSignal Search Banners or the Signal Shop.

The Signal Search Banners option is onthe same menu that players get new agents from, as one of theSearch options is specifically for rare W-Engines. TheSignal Shopis where players canpurchase many in-game itemsfor real-life and in-game currency,including specific rare W-Engines.

The equipment page for W-Engines and Grace Howard in Zenless Zone Zero.

For the Signal Shopin particular, players needResidual Signalto purchase the Fusion Complier, while forSignal Search Banners,playersneed Encrypted Master Tapes.

How To Use The Fusion Compiler

First off, the Fusion Compiler isa W-Engine designed for the agent Grace Howard, who doesprimarily Electric damageand is designated asan Anomaly fighter. Playersdon’t have to put this W-Engine on Grace, but itsuits herskills and abilities the most.

An Anomaly fighter in ZZZis a fighter thatspecializes in debuffing enemiesalongside doing damage. Due to this W-Engine’s design,other agentsthat the Fusion Compiler suits includePiper and Jane.

As for what the Fusion Compiler offers, when equipped,it increases the agent’s base attackby a flat amount, starting at 12 percent and increasing based on what star the W-Engine is.

Also,when this W-Engine is equippedand theagent uses a Special Attackor an EX Special Attack, they willgain an increased Anomaly Proficiencyfor eight seconds,which can stackup to three times. The amount of proficiency also increases based on the star level of the Fusion Compiler.

Thestar level of a W-Engineis determined byhow many duplicatesa player hascollected and added to a single W-Engine, starting at one and reaching a maximum of five.

So, when equipped, the goal is touse your agents' Special Attacks as frequently as possibleto improve their Anomaly Proficiency and tokeep those stacks active. While it can stack up to three times,the times on each stack are independentof each other. If done at the right time, that means you canstretch these stacks over 24 seconds, which can be a long time in combat.