A bonus with an optional base value and optional per-level-up value.
"Level-up" is used as a generic term that can mean promotions for Characters or upgrades for Equipment or Perks.
Examples
| You type | You get |
|---|---|
|
|
Sanity +10 |
|
|
Sanity +5/level-up |
|
|
Sanity +10, +5/level-up |