Last Z: Survival Shooter Wrench Hoarding and Spending Guide

Hoarding 1,000 wrenches in Last Z: Survival Shooter is generally inefficient for non-maxed accounts. While a single four-digit dump yields a massive burst of vehicle parts and salvage scrap, saving up that many wrenches stalls your Combat Power (CP) progression for months. To maximize account growth and event rewards, spend your wrenches in smaller batches of 150 to 300 during active vehicle events instead of saving for a single 1,000-pull dump.

The Problem with Saving 1,000 Wrenches

Vehicle modifications provide critical percentage-based combat buffs, including troop attack, squad capacity, march speed, and damage mitigation. When you sit on hundreds of unspent wrenches, those combat stats remain locked as raw inventory items rather than defending your shelter or strengthening rallies.

While a 1,000-wrench session triggers gacha pity thresholds multiple times to award epic or legendary components, vehicle effectiveness depends on specific slot upgrades and matching set bonuses. A massive pull often gives duplicate items for slots you have already filled while leaving other vehicle positions unimproved. The sudden CP spike you receive after a 1,000-wrench dump simply restores the combat strength your account missed out on during months of hoarding.

Event Scoring and Milestone Overcapping

Wrenches should only be spent during scoring events where vehicle upgrades generate points, such as Alliance Duel (VS) or State vs. State (SvS) vehicle modification days. Spending wrenches outside these events wastes valuable secondary rewards, such as advanced recruitment passes, diamonds, and universal hero fragments.

However, spending 1,000 wrenches during a single event day is wasteful for most players. Routine VS and SvS events feature fixed milestone point caps:

• Milestone Chests: Most weekly modification days max out their top-tier milestone chests at modest point totals. Spending between 200 and 250 wrenches is usually enough to claim every chest reward.
• Point Wastage: Any points earned beyond the final milestone chest contribute strictly to leaderboard rankings. Competing for top rank against high spenders requires far more than 1,000 wrenches, meaning surplus points above the final milestone chest yield no practical return.
• Cycle Distribution: Dividing 1,000 wrenches across four separate event cycles secures four rounds of top milestone rewards, providing far more universal items than a single 1,000-wrench spend.

How to Manage Scrap and Refinement

The primary value of pulling high volumes of vehicle modifications comes from recycling surplus items into scrap. You will accumulate hundreds of lower-tier green and blue parts that must be dismantled to upgrade your primary components:

1. Lock Core Components: Before batch-dismantling your inventory, manually lock your equipped and best-in-slot parts to prevent accidental recycling.
2. Batch Salvage Surplus: Dismantle all unlocked lower-tier duplicates to convert them into upgrade scrap.
3. Prioritize Universal Attributes: Funnel your scrap into universal stats like overall damage dealt and damage reduction. Avoid investing heavily in narrow secondary stats until your primary combat attributes are established.

Recommended Spending Rules

Adjust your wrench management based on your current account progression:

• Early-to-Mid Game Rosters: Spend wrenches whenever you have enough to unlock the third or fourth reward tier in active vehicle events. Getting baseline vehicle stats running immediately boosts zombie clearing speeds and resource gathering.
• Competitive Mid-to-Late Game Rosters: Maintain a floating reserve of 150 to 300 wrenches. This reserve lets you clear all top-tier milestone chests whenever an SvS or Alliance Duel vehicle day appears, without leaving dormant stats sitting in your bags.
• Leaderboard Pushers: Only stockpile beyond 500 wrenches if you have already optimized your primary vehicle marches and are saving specifically to contest a server-first placement or a limited cosmetic event.