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Archives of Nethys

Archives of Nethys

Pathfinder RPG (1st Edition) Pathfinder RPG (2nd Edition) Starfinder RPG

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GM Core / Chapter 2: Building Games / Encounter Design

Dynamic Encounters

Source GM Core pg. 78 2.0
While you can certainly create enjoyable encounters by placing a group of opponents in a square room with little else, you have numerous tools to create encounters that are more interactive and dynamic. These tools can challenge your players to invent new strategies, inspire interesting character decisions, and make your setting richer.

No encounter needs to use all of the elements presented here, and not all encounters need more than one or two. The more complex a dynamic encounter is, the longer it takes to run and the more demanding it is. In general, these tools are perfectly suited for boss encounters, for memorable foes, and as a spice to add throughout your campaign however often works best for you and your players.

Hazards in Combat

Source GM Core pg. 78 2.0
In isolated encounters where the PCs have plenty of time to recover from hazards' effects, simple hazards can feel more like speed bumps than true challenges. But when combined with other threats, even simple hazards can prove perilous. A noisy explosion can draw attention, allowing foes to burst through the door for a dramatic start to the encounter. Simple hazards can also be an active part of an encounter, particularly if the foes know how to avoid triggering them.

As their name suggests, complex hazards are a more powerful tool for encounters. Because they continue to act, they are an ongoing presence in the fight. When combined with hostile creatures, complex hazards offer the PCs plenty of choices for what they want to do next. This is particularly true if foes benefit from the hazard. Should the PCs first disable the array of pipes spewing magical fire into the room, or should they prioritize the fire elemental growing stronger with exposure to the inferno? There's no right answer, and the PCs' choices have a clear impact on the obstacles they face. Hazards in combat shine when they give the PCs ways to contribute meaningfully other than dealing damage to a creature. Interesting actions to disable a hazard are a fun way to give several PCs something fresh and different to do rather than piling on damage.

Evolving Battlefields

Source GM Core pg. 78 2.0
While some battlefields are relatively static, allowing the PCs and foes to clobber each other until one side wins, complex or evolving battlefields can lead to far more memorable encounters. One of the most straightforward ways to create an evolving battlefield is with dynamic environmental features. Maybe the floating platforms that make up the room's floor shuffle around on their own turn each round, or various points teleport creatures to different locations—possibly between two rooms where separate battles take place simultaneously. These dynamic features have some overlap with complex hazards, though they don't tend to be an opposition or obstacle specifically threatening the PCs.

Similarly, a third party in the encounter, perhaps a rampaging monster or a restless spirit, could pose a danger to both sides but potentially benefit either. For instance, perhaps the PCs or their foes could harness this third party as a dangerous but powerful ally with a successful skill check of some kind or by making a risky bargain.

Sometimes the evolving battlefield is more of a state change, or series of state changes, and less of a constant presence. For instance, defeating a ritualist and ending his ritual could cause the foes to lose a powerful beneficial effect but unleash a demon that crawled through the remains of the botched ritual, or cause part of the room to collapse from the magical backlash. Major physical changes to the environment, like such a collapse, portions of the room rising or falling, or water beginning to rush in and fill the room, can force the PCs to rethink their plans to handle the new situation. Sometimes the evolving battlefield is more of an unexpected plot twist that occurs in the middle of the encounter. Perhaps the evil tyrant reveals that they were a dragon all along, or reinforcements arrive for whichever side was outmatched. Whatever you choose, make sure it changes things up and makes the encounter feel more dynamic and different. For instance, raising up a portion of the battlefield that isn't particularly relevant when neither the PCs nor their foes are likely to care is less interesting than raising up the pedestal holding the jewel the PCs and their enemies are trying to recover.

Combining and Separating Encounters

Source GM Core pg. 79 2.0
Picture this: the PCs storm a castle. They choose to eschew stealth in favor of a direct approach. On the ramparts, a guard spots them and raises an alarm. The sound of horns and whistles blares throughout the keep as each defender ensures that everyone is ready for a fight. And then, they politely wait in whatever room they were already standing in for the PCs to come and attack them. It sounds pretty unrealistic, and it feels unrealistic at the table. Many players find it far more satisfying when their foes take reasonable actions and countermeasures against them, such as moving to defensible positions or banding together with allies. Taken to an extreme, combining encounters can quickly lead to fights that are unwinnable, so be careful. In the castle example, some guards may come out to attack the PCs, while others cluster around the central keep. Perhaps each individual patrol of guards around the castle is a trivial-threat encounter, but as they gather together, they form groups of gradually escalating threat. Such groups give the PCs a sense of how challenging their opposition is, so that if a fight against six guards is a challenge, they won't try to pick a fight with 30. When the PCs' foes amass into an overwhelming force, give the PCs fair warning and a chance to retreat and try again another day. Of course, if the PCs come back after the alarm has been raised, the guards are likely to change their rotations to better secure the keep.

The most common reason to separate an encounter into multiple pieces is to set up a combined encounter, like when an injured foe retreats to gather reinforcements. This provides the PCs with a choice: do they ignore the fleeing enemy and focus on the battle in front of them, or do they split their own forces, weighing the risk of being led into a dangerous encounter against the chance of stopping later foes from preparing for their approach? An encounter might also separate into pieces because of dramatic changes to the battlefield, such as a collapsing ceiling or a magical wall that prevents those on each side of the barrier from accessing the other without spending actions to bypass the obstruction.

Pitfalls

This section arms you with a wide variety of useful tricks to add interest to your encounters, but you should keep an eye out for some common pitfalls of encounter building.
  • Don't Make Every Encounter Complex: There are many ways to make complex and dynamic encounters, but making every single encounter complex will become exhausting for you and your players. Some encounters should be simple, both because it will make the world feel more real and because it's a good way for the group to relax without as much to keep track of.
  • Avoid Flat Difficulty: Ensure that not too many of your encounters fall at the same threat level. Having some low- and even trivial-threat battles adds variety, and it's great to throw in a few severe encounters beyond just bosses.
  • Beware of Unexpected Difficulty: You might end up with creatures that have abilities that fit well together, making them extremely powerful as a combo, or that are particularly well-suited against your PCs. Compare the creatures and what you know about your PCs in advance, especially if the encounter is already a severe threat by the numbers. Page 26 has suggestions for what to do if you find a spike in difficulty during an encounter rather than in advance.
  • Watch for Overpowered Terrain: As noted under Budgeting for Terrain, some features of the environment can increase the danger drastically. Consider your creature and the environment, and see whether the creature has a massive advantage compared to PCs in that terrain, such as a monster with powerful, long-range attacks when PCs are stuck at a distance. If so, you might want to adjust.

Time Pressure

Source GM Core pg. 79 2.0
Time pressure adds an extra sense of urgency to any encounter and can be a great way to make an otherwise trivial- or low-threat encounter tactically engaging, satisfying, and memorable. After all, while low- and trivial-threat encounters have an incredibly low chance of defeating the PCs, the opposition can usually hold on long enough to make the PCs spend a few rounds to defeat them unless the PCs expend more resources than they normally would on such foes. Time pressure is often related to a secondary objective in the encounter, though it could be a countdown directly related to the encounter itself. For instance, if the ritual will grant a lich its apotheosis in 4 rounds, the heroes need to defeat the lich before then!

Secondary Objectives

Source GM Core pg. 79 2.0
One of the simplest and most exciting ways to create a dynamic encounter, even if the combat itself is not so difficult, is to add a secondary objective beyond simply defeating foes. Perhaps the villains are about to burn captives in a fire, and some of the PCs need to divert their efforts to avoid a pyrrhic victory. Encounters with a parallel objective that require PCs to take actions other than destroying foes can keep those foes around long enough to do interesting things without inflating their power level. It also gives PCs skilled in areas related to the side mission a chance to shine.

Sometimes a secondary objective might present a time limit, like if the PCs need to prevent evidence from being burned, either by fighting quickly or by actively protecting the documents. Another type of secondary objective relates to how the PCs engage in combat with the primary opposition. The PCs might need to use nonlethal attacks against guards who mistakenly believe the PCs are criminals, or they might need to prevent slippery scouts from retreating to alert others. Options like these highlight mobile characters like the monk. You could even create truly off-the-wall secondary objectives that require the PCs to lose the encounter in order to succeed. The PCs might need to put up a believable fight but retreat and let foes steal their caravan in order to follow the foes back to their lair. Secondary objectives are a great way to highlight different abilities in combat and make for a memorable encounter, but—like all of these tactics—they can become annoying if overused.

Opponent Synergy

Source GM Core pg. 80 2.0
Most encounters assume that the PCs' opponents work together to oppose the PCs, but when groups of foes have been collaborating and fighting together for a long time, they can develop additional strategies. Consider giving each member of these tightly knit teams a reaction triggered by their allies' abilities, or another benefit they gain based on their allies' actions. Just as a team of PCs learns how to best position the rogue to flank enemies and minimize the harm they take from the wizard's fireball spell, NPCs can learn to complement each other's strategies and avoid interfering with each other. On the opposite end of the spectrum, opponents with poor coordination make the fight much easier for the PCs. Poor coordination between mindless creatures is common, and PCs can use clever tactics to run circles around these foes. When intelligent creatures accidentally (or deliberately) harm each other or pursue conflicting strategies, particularly if they engage in banter with each other as they fight, it can make for an amusing break in the typical rhythm of combat.

When taken to its extreme, synergy can represent the actions of a hive mind or a single massive creature. These synergistic components can be creatures, hazards, or both. For example, instead of representing a kraken the size of a warship as a single foe, you could represent each of its tentacles as an individual opponent. Perhaps the kraken can sacrifice actions it would otherwise use to crush PCs in its maw to use its tentacles more freely. In this case, you could model a field of tentacles as a complex hazard that mainly reacts to the PCs moving within it, but allow the kraken's head to act with a few tentacles directly.

Misdirection

Source GM Core pg. 80 2.0
Sometimes, a bit of misdirection can add a lot of interest to an encounter, especially against offense-heavy groups. Rather than amping up the opposition to match the PCs' firepower and creating opponents whose own offenses are too powerful for the PCs' defenses, consider a little sleight of hand. For instance, a villain might have an illusory or disguised decoy target with just enough durability to take a few hits while the true villain is hiding nearby, ready to emerge and attack. Illusion spells can allow a foe to attack from a safer position, and possession grants the foe a disposable body unless the PCs brought along spirit blast or similar magic. Sometimes you can even hide the villain in plain sight: for instance, in an encounter with three goblins with similar-looking gear and an ogre, one of the goblins might be the biggest threat, but the PCs are likely to target the ogre first.

Care when setting up the battle map can also go a long way to misdirect your players—or at least avoid accidentally telegraphing what an encounter will be. For instance, if you always put out statue minis whenever there are statues in the room, the PCs might at first be overly suspicious of ordinary statues, but they will be more surprised later on when a statue turns out to be a construct than if you place minis only when the statue is actually a construct.

Recurring Villains

Source GM Core pg. 81 2.0
Not every villain dies the first time the PCs defeat them in combat. Some may escape, perhaps through teleportation, misdirection, or with other ploys. When a villain escapes and lives to fight the PCs again another day, it’s good to have that foe learn from their past failures. In their next encounter with the PCs, give them additional minions, spells, or other defenses designed to counteract the strategies the PCs used against them previously. Even if the villain doesn’t escape, they might have other tricks up their sleeves, such as rising again to oppose the PCs. They could well return later in the adventure—or they might come back immediately for a second battle, so long as there is a proper justification for doing so. For example, defeating an otherworldly villain’s outer shell might reveal its terrible true form, or a previously living necromancer might rise again as an undead monstrosity bent upon destroying the PCs.