The 160 Wall can freeze an account even when its roster has passed 170 Nikkes: five poorly planned leaders determine whether Scarlet, Modernia, or a new Pilgrim stays capped. This NIKKE Synchro Device Guide explains the top-five rule, why the late-2025 25 default slots matter, and how veterans avoid wasting SSR dupes on the wrong progression path.

Unlock the Synchro Device and Read the Top-Five Rule

Clear Campaign Stage 4-15 first, then open the Synchro Device in the Outpost. It automatically selects your five highest-level Nikkes as leaders; the lowest level among those five becomes the shared Synchro Level. Late-2025 Ver. 8.7 increased the default capacity to 25 slots, a major quality-of-life change for growing accounts.

Keep the distinction clear: Synchro shares level and level-based stats, not the whole build. Gear, skill levels, Bond, cubes, and OL gear sub-stats remain on each individual Nikke. Adding an expansion-slot unit copies the current Synchro Level, but it never raises that level; only manually leveling the five leaders does that.

Break the 160 Wall with SR Leaders, MLB, and SSR Caps

Start with five fully limit-broken SR leaders if your SSR dupes are not ready. SRs with 2 Limit Breaks can reach Level 160, while an SSR needs 3 Limit Breaks/MLB to reach its Level 200 cap. Veterans know the 160 Wall is a star-check, not a grind-check: more Battle Data and Core Dust cannot substitute for five MLB SSRs.

Before spending selectors or duplicate resources, map a five-SSR MLB core instead of chasing every fresh banner. Track B1/B2/B3 coverage, Pilgrim carries, and future Favorite Item candidates after the leader core is stable; a powerful bench unit at Level 160 still helps through Synchro. Once five SSR leaders hit Level 200, Enhanced Synchro takes over and the device, rather than each Nikke, becomes the level target.

Expansion Slot Strategy for a 170+ Nikke Roster

Treat the 25 default slots as content toolboxes, not as a reason to disturb your five leaders. Slot a usable B1, B2, and B3 for campaign deficit teams, boss specialists for raids, Pilgrims, and Favorite Item beneficiaries; then swap based on the next mode rather than resetting leaders for each banner. Before anniversary slot expansions or passes, verify patch notes and livestream details through the NIKKE homepage, not rumor threads. For any authorized web purchase, use the nikke top up shop workflow on Midasbuy: enter only your UID and server, then confirm the displayed in-game nickname before payment.

Check the removed unit’s cooldown in your own client before rotating slots. Late-2025 notes indicated cooldown removal or major reduction, while some 2026 reports still cite 4 hours; no single universal timer is publicly verifiable across every client state. Use a NIKKE Synchro Device reset only when a higher-level or MLB-ready leader is prepared to replace the outgoing one.

Verify Anniversary Deals Safely and Time Your Slot Spending

During the 4th Anniversary period, confirm official event dates, packs, and livestream announcements before committing Gems. The official anniversary livestream listed for October 24, 2026, 19:00 UTC+9 is the kind of announcement that can change banner and budgeting plans. Monthly Pass pricing, bundle contents, and first-purchase bonuses can vary by region, so treat in-client information and official notices as the final check.

Avoid cheap-gem sellers that request an email or password. Official recharge requires a Player ID/UID and server, while Level Infinite can ban accounts tied to refund abuse or illegal top-ups. Keep your five leaders intact, spend slots around actual team needs, and the Synchro Device will carry a 170+ roster far more efficiently than leveling every new SSR separately.