When to roll
Roll when the current lineup lacks a role, not whenever the button is available.
- Roll before the first map to fill basic slots.
- Roll when a world wall proves your current team is too weak.
- Roll after upgrades stop fixing the leak.
- Stop when the new unit solves the role you needed.
- Test the unit in a map before judging it.
When to boost luck
The public description confirms luck boosting, but exact odds were not collected.
- Use luck after the map route is stable.
- Use luck when unit quality is the bottleneck.
- Avoid luck boosts while placement is still random.
- Avoid exact odds claims unless the game UI shows them.
- Track whether the new unit changes a real clear, not only the collection screen.
Role-first thinking
A useful lineup covers waves better than a pile of rare names.
- Early-path damage stops leaks sooner.
- Long-range or repeated-hit units matter when enemies stay in range.
- Upgrade value depends on the map position.
- A later-world team should be tested against that world, not only compared by rarity.
- Keep one practical lineup before experimenting.