To upgrade the Rosa ST frame efficiently during the Mecharashi Mega Factory event, funnel your event currency directly into ST-specific offensive nodes in a strict order: max out Weapon Proficiency first, move to Critical Damage next, and finalize with Energy Efficiency. Because node investments in the Mega Factory are permanent and non-refundable, completing primary damage paths before spending resources on shop items or secondary traits prevents progress bottlenecks.
Rosa ST Upgrade Route Priority
The Mega Factory relies on fixed, milestone-gated upgrade tracks that alter base combat mechanics rather than granting minor passive stats. You must max out higher-priority nodes to meet threshold requirements for advanced branches in the event interface.
| Upgrade Priority | Focus Area | Mechanical Benefit |
|---|---|---|
| Priority 1 | Weapon Proficiency | Increases base damage output for main attack scaling |
| Priority 2 | Critical Damage | Multiplies damage scaling on successful critical procs |
| Priority 3 | Energy Efficiency | Lowers resource costs for primary skill usage |
Focusing on Weapon Proficiency early ensures your squad meets the raw damage output needed for higher event stages. Critical Damage amplifies this base layer, while Energy Efficiency provides sustainability once skills are fully leveled. Delaying defensive or utility traits until these three tiers are complete preserves event currency for core performance gains.
Event Resource and Stamina Management
Because event duration and daily stamina are limited, allocating resources efficiently dictates how far you can advance the Rosa ST frame.
- Focus Daily Stamina on Challenge Stages: Farm the highest difficulty challenge stages you can reliably clear, as these offer the optimal currency-to-stamina yield compared to standard event maps.
- Hold Event Currency for Milestone Requirements: Later ST nodes require rare component items found in deep factory tiers. Save currency to immediately unlock these milestones when reached.
- Defer Shop Cosmetics and Generic Items: Avoid purchasing cosmetic unlocks or general upgrade materials from the event shop until the main Rosa ST progression track is completely maxed.
- Evaluate Daily stamina Needs: Save stamina replenishment items for the final days of the event if you need a targeted push to reach a specific node threshold.
Directing daily playtime into the Mega Factory temporarily delays standard pilot experience and general mecha farming, so lock in your primary Rosa ST damage upgrades before balancing daily stamina across other game modes.
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Sarah Williams
Sarah specializes in RPG and collection games, explaining team building, character growth, and beginner-friendly ways to avoid expensive early mistakes.
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This helped me understand updates much better.
This guide answered the exact question I had.
The explanation is clear, especially for beginners.
Good guide for Mecharashi players. The updates part was useful.