§04.04 Game Systems
Radiation
- Survival
The bar drains only inside a radiation zone, faster at higher zone levels; at 0 the player gets Radiation Sickness and starts taking damage.
Drain & Damage
Zone tick: Level 1 every 0.2 s, Level 2 every 0.08 s, Level 3 every 0.04 s, each divided by the difficulty's Rad Severity Lvl1 setting (1 by default).
With a respirator and a working filter the drain is 0.75 ÷ 2 × (1 − the respirator's Radiation Protection %).
Without a respirator, each zone tick gives 0.1–0.25 Toughness XP.
At 0, the player takes 15 damage every 5 s.
Why It Matters for Item Stats
Bars scale 0–100, so a consumable’s "+20 Hunger" restores 20% of the bar and a "−15 Medical" cost is 15% of it. This model is what makes item restore values comparable.