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Building Hazards

Source Gamemastery Guide pg. 74
Building hazards designed for your game allows you to customize them to match your story, location, and needs, as well as to surprise the other players at every turn. There’s no wrong way to create a hazard, but this guide presents the information in the order you might see it in a hazard stat block.

Concept

Source Gamemastery Guide pg. 74
The first thing you’ll need is a concept for your hazard. What level is your hazard? Will it be simple or complex? Is it a trap, a haunt, an environmental hazard, or something else? If it’s a trap, is it mechanical, magical, or both? This is a good time to brainstorm the hazard’s name and description, as this will help you decide how the hazard can be disabled.

The following information builds on concepts from Building Creatures, which starts on page 56.

Hazard Types

Source Gamemastery Guide pg. 74
The three main types of hazards are traps, environmental hazards, and haunts.

Traps are usually built or placed, though they can also form accidentally, such as if a magic portal, through millennia of disuse, malfunctions as its magic warps. Mechanical traps always have some physical component, whereas purely magical traps typically don’t. Magical traps can usually be counteracted by dispel magic, and those without a listed proficiency rank for Stealth can be found using detect magic. Thievery is the most common skill used to disable traps.

Environmental hazards are either living things, like dangerous spores and molds, or simply features of the terrain or environment, like avalanches or rockslides. While they are always physical, some environmental hazards can’t reasonably be attacked or damaged, such as a cloud of poisonous gas or a patch of quicksand. Survival is the most common skill used to disable environmental hazards.

Haunts are spiritual hazards, usually formed when the spiritual essence of a location is imprinted with the instincts and emotions from a living being’s demise. Because haunts lack matter, they rarely involve a physical component, and when they do, that component is generally incorporeal or might even be damaged only by positive energy. The skills and options used to disable haunts vary, though using Religion for an exorcism is common. However, even with a successful check to disable a haunt, it can reoccur until its unfinished business is resolved. Typically, successfully disabling or enduring a haunt provides clues to determine what it would take to lay it to rest permanently.

Understanding and Choosing Statistics

Source Gamemastery Guide pg. 74
Much like for creatures, hazard statistics can be extreme, high, or low (hazards don’t need as much granularity, so they usually don’t have moderate or terrible values for their statistics). While they are defined in creature creation, when building a hazard, you’ll use the values slightly differently.

Extreme: While extreme values remain world-class statistics that are extremely difficult to meet or exceed, unlike with monsters, almost all hazards have one extreme statistic because hazards normally activate only if they have gone unnoticed or if someone critically failed to disable them. Does it have an extreme Stealth DC that makes it incredibly hard to find, an extreme Disable DC that makes it perilous to disable, or an extreme save DC that makes it deadly in the event it triggers? These are the most common choices, as each affects a different phase of encountering the hazard.

High: This is a capable level, and can generally serve as a baseline value; this value for hazards covers what would be the high and moderate ranges for creatures.

Low: If a hazard has a weakness, like a poor Reflex save for a bulky mechanical trap or an easy DC to disable for a hard-to-find trap, it usually has a low value. If you need something even lower, use a terrible value from Building Creatures, or just an incredibly low value like the Armageddon Orb’s Stealth.

Stealth and Disable

Source Gamemastery Guide pg. 75
When determining a hazard’s combat statistics, first decide how the hazard can be located and how hard it is to disable. A hazard where the main challenge is how difficult it is to find, like the Core Rulebook’s hidden pit, might have a very different effect for its level than a hazard out in plain sight, daring a PC to try to disable it, like the Armageddon orb.

Table 2–13: Stealth and Disable DCs

Level	Extreme	High	Low
–1	18	15	12 to 11
0	19	16	13 to 12
1	20	17	14 to 13
2	21	18	15 to 14
3	23	20	17 to 15
4	25	22	18 to 17
5	26	23	20 to 18
6	28	25	21 to 19
7	30	27	23 to 21
8	31	28	24 to 22
9	33	30	26 to 23
10	35	32	27 to 25
11	36	33	29 to 26
12	38	35	30 to 27
13	40	37	32 to 29
14	41	38	33 to 30
15	43	40	35 to 31
16	45	42	36 to 33
17	46	43	38 to 34
18	48	45	39 to 35
19	50	47	41 to 37
20	51	48	42 to 38
21	53	50	44 to 39
22	55	52	45 to 41
23	56	53	46 to 42
24	58	55	48 to 43

When deciding how your hazard is disabled, come up with a narrative description of how it would happen, which will inform which methods and skills disable the hazard. You’ll need to decide the proficiency rank necessary to find the hazard as well as disable it with each method. Remember, a hazard without a listed rank next to its Stealth DC is obvious enough that creatures can find it without Searching, and magical hazards without a listed rank are not normally protected against detect magic. Most hazards built by intelligent creatures are concealed have at least a trained rank. Table 2–14 indicates the high and moderate proficiency requirements by level; you can use lower proficiency ranks than the ones listed, and if you use the high rank, consider a secondary, perhaps less-efficient method to disable the hazard using a lower rank. For instance, the bloodthirsty urge haunt in the Core Rulebook can be disabled with master Religion, or by a higher DC with expert Diplomacy.

If you need a Stealth modifier for a complex hazard, just subtract 10 from the listed DC.

Table 2–14: Minimum Proficiency

Levels	High	Moderate
0 or lower	Untrained	Untrained
1–4	Trained (expert for Perception)	Trained
5–8	Expert	Trained
9–18	Master	Expert
19 or higher	Legendary	Master

Defenses

Source Gamemastery Guide pg. 75
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.

Table 2–15: Defenses

Level	EAC	HAC	LAC	E Save	H Save	L Save	Hardness	HP*
–1	18	15	12	+9	+8	+2	2–4	11–13
0	19	16	13	+10	+9	+3	3–5	15–17
1	19	16	13	+11	+10	+4	5–7	23–25
2	21	18	15	+12	+11	+5	7–9	30–34
3	22	19	16	+14	+12	+6	10–12	42–46
4	24	21	18	+15	+14	+8	11–13	46–50
5	25	22	19	+17	+15	+9	12–14	50–54
6	27	24	21	+18	+17	+11	13–15	54–58
7	28	25	22	+20	+18	+12	14–16	58–62
8	30	27	24	+21	+19	+13	15–17	62–66
9	31	28	25	+23	+21	+15	16–18	66–70
10	33	30	27	+24	+22	+16	17–19	70–74
11	34	31	28	+26	+24	+18	19–21	78–82
12	36	33	30	+27	+25	+19	20–22	82–86
13	37	34	31	+29	+26	+20	21–23	86–90
14	39	36	33	+30	+28	+22	22–24	90–94
15	40	37	34	+32	+29	+23	23–25	94–98
16	42	39	36	+33	+30	+25	25–27	101–107
17	43	40	37	+35	+32	+26	27–29	109–115
18	45	42	39	+36	+33	+27	29–31	117–123
19	46	43	40	+38	+35	+29	31–33	125–131
20	48	45	42	+39	+36	+30	33–35	133–139
21	49	46	43	+41	+38	+32	36–38	144–152
22	51	48	45	+43	+39	+33	39–41	156–164
23	52	49	46	+44	+40	+34	44–46	168–176
24	54	51	48	+46	+42	+36	46–50	180–188

* The Broken Threshold is usually half the hazard’s HP. 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.

Offense

Source Gamemastery Guide pg. 76
Almost all hazards need an attack bonus or a save DC, and hazards that deal damage need to list a damage value. Simple hazards deal about twice as much damage as complex hazards and have an attack bonus even higher than the extreme attack bonus for a creature (abbreviated as S. Atk in Table 2–16: Offense). Complex hazards usually have attack bonuses akin to a high attack bonus for a creature (abbreviated as C. Atk in Table 2–16). You can adjust them further using Table 2–9: Attack Bonus on page 64 if your hazard needs it. Simple hazard DCs aren’t as high for their level as their attack bonuses are, since effects with DCs usually have some effect even on a successful saving throw; use the EDC and HDC columns for extreme and hard DCs on Table 2–16: Offense below.

The damage columns on the table give a damage expression you can use, followed by the average damage in parentheses. If you want to make your own damage expression, remember that average damage is 2.5 for a d4, 3.5 for a d6, 4.5 for a d8, 5.5 for a d10, and 6.5 for a d12.

Table 2–16: Offense

Level	S. Atk	C. Atk	Simple Dmg	Complex Dmg	EDC	HDC
–1	+10	+8	2d4+1 (6)	1d4+1 (3)	19	16
0	+11	+8	2d6+3 (10)	1d6+2 (5)	19	16
1	+13	+9	2d6+5 (12)	1d6+3 (6)	20	17
2	+14	+11	2d10+7 (18)	1d10+4 (9)	22	18
3	+16	+12	2d10+13 (24)	1d10+6 (12)	23	20
4	+17	+14	4d8+10 (28)	2d8+5 (14)	25	21
5	+19	+15	4d8+14 (32)	2d8+7 (16)	26	22
6	+20	+17	4d8+18 (36)	2d8+9 (18)	27	24
7	+22	+18	4d10+18 (40)	2d10+9 (20)	29	25
8	+23	+20	4d10+22 (44)	2d10+11 (22)	30	26
9	+25	+21	4d10+26 (48)	2d10+13 (24)	32	28
10	+26	+23	4d12+26 (52)	2d12+13 (26)	33	29
11	+28	+24	4d12+30 (56)	2d12+15 (28)	34	30
12	+29	+26	6d10+27 (60)	3d10+14 (30)	36	32
13	+31	+27	6d10+31 (64)	3d10+16 (32)	37	33
14	+32	+29	6d10+35 (68)	3d10+18 (34)	39	34
15	+34	+30	6d12+33 (72)	3d12+17 (36)	40	36
16	+35	+32	6d12+35 (74)	3d12+18 (37)	41	37
17	+37	+33	6d12+37 (76)	3d12+19 (38)	43	38
18	+38	+35	6d12+41 (80)	3d12+20 (40)	44	40
19	+40	+36	8d10+40 (84)	4d10+20 (42)	46	41
20	+41	+38	8d10+44 (88)	4d10+22 (44)	47	42
21	+43	+39	8d10+48 (92)	4d10+24 (46)	48	44
22	+44	+41	8d10+52 (96)	4d10+26 (48)	50	45
23	+46	+42	8d12+48 (100)	4d12+24 (50)	51	46
24	+47	+44	8d12+52 (104)	4d12+26 (52)	52	48

Designing Simple Hazards

Source Gamemastery Guide pg. 76
When designing a simple hazard, make sure to select an appropriate trigger and effect. Often, a simple hazard that merely damages its target is little more than a speed bump that slows down the game without much added value, so think about the purpose of your hazard carefully, both in the story and in the game world, especially when it’s a hazard that a creature intentionally built or placed in that location. A great simple hazard does something interesting, has a longer-lasting consequence, or integrates with the nearby inhabitants or even the encounters in some way (you can find more information on integrating hazards with encounters in Dynamic Encounters on page 48).

Designing Complex Hazards

Source Gamemastery Guide pg. 76
Unlike a simple hazard, a complex hazard can play the part of a creature in a battle, or can be an encounter all its own. Many of the concerns with damaging effects when designing a simple hazard don’t apply when designing a complex hazard. A complex hazard can apply its damage over and over again, eventually killing its hapless victim, and isn’t intended to be a quick-to-overcome obstacle.

Complex hazards have a lot more in common with creatures than simple hazards do, and you’ll see that a complex hazard’s statistics are similar to those of a creature. A good complex hazard often requires disabling multiple components or otherwise interacting with the encounter in some way. For instance, while the Core Rulebook’s poisoned dart gallery requires only one Thievery check to disable, the control panel is on the far end of the gallery, so a PC would need to make their way across first.

Building Routines

Source Gamemastery Guide pg. 76
A complex hazard has a routine each round, whether it stems from preprogrammed instructions built into a trap, instincts and residual emotions swirling around a complex haunt, or a force of nature like sinking in quicksand. Make sure to build a routine that makes sense for the hazard; an environmental lava chute that ejects lava into the area each round shouldn’t be able to seek out and precisely target only the PCs, but it might spatter random areas within range or everything within range, depending on how you describe the hazard. However, a complex haunt might be able to recognize life force and target living creatures.

If you create a hazard that can’t consistently attack the PCs (like the Core Rulebook’s blade pillar, which moves in a random direction), you can make it deadlier than normal in other ways.

The hazard should have as many actions as you feel it needs to perform its routine. If you split the routine out into several actions, you can also remove some of the hazard’s actions once partial progress is made in disabling or destroying it; this can give the PCs a feeling of progress, and it can encourage them to handle the hazard if it appears in a encounter alongside creatures.

Archives of Nethys

Rules Index | GM Screen

Table 2–13: Stealth and Disable DCs

Table 2–14: Minimum Proficiency

Table 2–15: Defenses

Table 2–16: Offense