4★ Tier Up Boost
Research · STATION
Reduces the base tier up times for all Grade 4+ ships.
- Tree
- STATION
- Requires
- Ops 42 · 4★ Interceptor Repair Cost 1 · 4★ Explorer Repair Cost 1 · 4★ Battleship Repair Cost 1 · SHIPYARD 42
- Requires at level 10
- Ops 50 · 4★ Interceptor Repair Cost 10 · 4★ Explorer Repair Cost 10 · 4★ Battleship Repair Cost 10