How disc rolls work
Drive discs are ZZZ's gear system — and its math is simple once you see it: fixed substat pools, a fixed number of rolls, and maximum values per roll. Here's the whole system, and how to grade what drops.
Quick answer
Every S-rank disc has one main stat and up to four substats. Substats roll from a fixed pool with known maximum single-roll values, and leveling a disc to +15 adds rolls in steps. A disc's quality is just how close its total rolls came to those maximums — which is exactly what the disc scorer measures.
The roll system
- Pool: each disc slot offers a subset of possible substats (e.g. crit can't appear everywhere). That's why crit pieces are hunted in specific slots.
- Rolls: a +15 S-rank disc has four substats and five roll increments — the first substat comes with one roll, and upgrades add rolls to existing substats or reveal new ones. [VERIFY exact upgrade pacing per version]
- Caps: every substat has a maximum per roll — Crit Rate 2.4% and Crit DMG 4.8% are the community-cited S-rank caps, and the full table lives on the methodology page.
Why "bad for X, god-tier for Y" is real
An anomaly agent wants Anomaly Proficiency and PEN; a stunner wants HP and DEF utility; a DPS wants crit and ATK%. The same 60% RV disc is trash for one and playable for another. Before foddering anything, check who else on your roster could use those exact substats.
Grading workflow
- Score every new S-rank disc in the disc scorer at +0 — the substat values already tell you the ceiling.
- Level to +9 first if RV looks strong; re-score. Early rolls decide most of a disc's fate.
- Keep: 85%+ RV, or any crit piece with both crit substats. Fodder: under 55% once you hold two alternatives.
- Re-check the set: a 70% RV disc completing a two-piece bonus usually beats an 80% RV off-set piece.
Common mistakes
- Leveling to +15 before scoring — tuners are the scarcest currency in the endgame loop.
- Chasing four perfect substats; two maxed crit rolls on ATK% discs already clear most content.
- Judging crit by damage alone instead of crit value — see crit value explained.