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GM Core / Chapter 2: Building Games / Building Creatures

Defenses

Source GM Core pg. 117 2.0
Consider adjusting your creature’s HP, AC, and saves in tandem based on its theme. Almost no creature has great defenses in all areas, and such creatures often result in frustrating fights. A creature with extreme AC might mean reducing its HP to the next lowest category, or reducing its HP by a smaller amount and making another reduction elsewhere. On the other hand, a creature that’s easy to hit could have more HP and a strong Fortitude save to compensate.

Armor Class

Source GM Core pg. 117 2.0
Because AC is one of the most important combat stats, you need to be more careful when setting this number for any creature you expect to end up in a fight. Low AC typically fits spellcasters, who compensate with their selection of powerful spells. Most creatures use high or moderate AC—high is comparable to what a PC fighter would have. Reserve extreme AC for a creature that is even better defended; these values are for creatures that have defenses similar in power to those of a champion or monk.

Table 2–5: Armor Class

LevelExtremeHighModerateLow
–118151412
019161513
119161513
221181715
322191816
424212018
525222119
627242321
728252422
830272624
931282725
1033302927
1134313028
1236333230
1337343331
1439363533
1540373634
1642393836
1743403937
1845424139
1946434240
2048454442
2149464543
2251484745
2352494846
2454515048

Saving Throws

Source GM Core pg. 118 2.0
You can often set saves quickly by assigning one high, one moderate, and one low modifier. Some creatures might vary from this, either because they have poor AC but better saves or because they should thematically have multiple good saves and compensate elsewhere. You have more flexibility with saves, and having one save be 1 more or 1 less than the listed number is rarely a big deal. Pay attention to the creature's Con, Dex, and Wis modifiers—these don't have to correspond to the creature's saves exactly, but should inform your choices.

Extreme saves often pair with extreme or high attribute modifiers. Almost no creature should have more than one extreme save, even at high levels. Assign terrible saves to creatures that have a clear weak point—for example, a nearly immobile creature would have a terrible Reflex save.

Table 2–6: Saving Throws

LevelExtremeHighModerateLowTerrible
–1+9+8+5+2+0
0+10+9+6+3+1
1+11+10+7+4+2
2+12+11+8+5+3
3+14+12+9+6+4
4+15+14+11+8+6
5+17+15+12+9+7
6+18+17+14+11+8
7+20+18+15+12+10
8+21+19+16+13+11
9+23+21+18+15+12
10+24+22+19+16+14
11+26+24+21+18+15
12+27+25+22+19+16
13+29+26+23+20+18
14+30+28+25+22+19
15+32+29+26+23+20
16+33+30+28+25+22
17+35+32+29+26+23
18+36+33+30+27+24
19+38+35+32+29+26
20+39+36+33+30+27
21+41+38+35+32+28
22+43+39+36+33+30
23+44+40+37+34+31
24+46+42+38+36+32