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GM Core / Chapter 2: Building Games / Building Hazards

Defenses

Source GM Core pg. 110 2.0
If there's a physical component that a character could break, you'll need to determine the hazard's AC, Fortitude save, and Reflex save, using the extreme, high, and low values (preceded by E, H, or L on the table) as well as its Hardness, HP, and Broken Threshold (BT). When building a purely magical or formless hazard, you can skip this section.

Some hazards, even high-level ones, don't make sense with a high Hardness value. In those cases, you can skip the Hardness and use the HP values from table 2–7: Hit Points on page 63. Especially for complex hazards, you might want to divide the durability over multiple sections, located in different positions, to encourage teamwork and mobility.

Table 2–15: Defenses

LevelEACHACLACE SaveH SaveL SaveHardnessHP*
–1181512+9+8+22–411–13
0191613+10+9+33–515–17
1191613+11+10+45–723–25
2211815+12+11+57–930–34
3221916+14+12+610–1242–46
4242118+15+14+811–1346–50
5252219+17+15+912–1450–54
6272421+18+17+1113–1554–58
7282522+20+18+1214–1658–62
8302724+21+19+1315–1762–66
9312825+23+21+1516–1866–70
10333027+24+22+1617–1970–74
11343128+26+24+1819–2178–82
12363330+27+25+1920–2282–86
13373431+29+26+2021–2386–90
14393633+30+28+2222–2490–94
15403734+32+29+2323–2594–98
16423936+33+30+2525–27101–107
17434037+35+32+2627–29109–115
18454239+36+33+2729–31117–123
19464340+38+35+2931–33125–131
20484542+39+36+3033–35133–139
21494643+41+38+3236–38144–152
22514845+43+39+3339–41156–164
23524946+44+40+3444–46168–176
24545148+46+42+3646–50180–188
* The Broken Threshold is usually half the hazard’s HP.