MechanicThe full luck system: how effective luck is computed, what each level of Luck costs, how far the odds actually stretch, and every source that multiplies it. Checked 2026-11-08.
Quick answer
Effective Luck = Luck level × Super Luck (×2) × server Luck boost × Index Luck bonus × World multiplier (×1, ×2 or ×4) × event/shop boosts.
Every turret has a 'switch-on' luck point where its odds jump sharply. By roughly 150 effective luck every turret has switched on; beyond that, extra luck stops improving odds and more roll slots or more rolls are the answer..
The practical takeaway: buy Luck levels aggressively while they are cheap (the first ten levels total about $2.2K), keep climbing while the bands are affordable, and stop expecting odds to improve around 150 effective luck — from there, roll slots and more rolls are what find rare turrets.