Encounter Run-Down: The Slaad Lair at the Chasm
Party: 6 PCs, Level 7 (Fully rested from Casalon) Enemies: 1 Green Slaad (Max HP: 170) and 2 Red Slaadi (Max HP: 93 each)
1. The Setup & The Lure
Making - Combat Battlemap Layouts
Begin by setting the scene as the party discovers the chasm.
DM Description: “You enter a massive natural cavern, its full extent lost in the oppressive darkness. A deep, 40-foot-wide chasm splits the cavern floor, and a faint, cold draft rises from its unseen depths. On the far side, you can just make out the pulsing cyan light of Power Junction Beta, your objective. The only way across is a precarious, makeshift bridge of fallen stone pillars and twisted metal beams, barely five feet wide.”
“Then, a sound cuts through the silence. A weak, sobbing cry from the far side of the chasm, near the junction. Peeking through the rubble, you see what looks like a Cyran survivor in tattered finery, huddled and seemingly injured. They call out, ‘Is someone there? Please, help me! I’m trapped!‘”
The party will likely attempt to cross the bridge. This is the trap. Let at least two, preferably three, party members get onto the bridge before you spring it.
2. The Ambush (Round 1)
This first round is about establishing maximum chaos.
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Trigger: As soon as the party is split and vulnerable on the bridge.
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DM Narration:
“As you carefully make your way across the rubble-strewn bridge, the ‘survivor’ on the other side suddenly stands. Their face twists into a horrifying, unnatural grin as their form ripples and contorts with a sickening croak into a monstrous, bipedal frog-like horror with warty green skin and terrible claws – a Green Slaad! Before you can even react, two more hulking, crimson-skinned brutes – Red Slaadi – burst from behind rock formations on the far side, one charging directly at the bridge itself!”
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Roll Initiative!
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Slaadi’s First Turn:
- Green Slaad (The Controller): Its goal is maximum disruption. A great opener is casting Fear or Fireball targeting the characters clustered on the bridge and the near side of the chasm. It will use the environment for cover, staying back from the ledge initially.
- Red Slaadi (The Brawlers): They act with brutish aggression. One charges onto the bridge to engage the party members there, trying to grapple and shove. The other might use its action to attack the bridge itself (treat a 5-foot section as an object with AC 15 and 30 HP), trying to destroy it and drop players into the chasm.
3. Mid-Fight Tactics & Priorities
- Red Slaadi: Their job is to be an overwhelming physical threat. They will relentlessly attack with their Claws, trying to infect PCs with Chaos Phage. They are intelligent enough to use Shove actions near the chasm edge. Remember their Death Burst – when one dies, it explodes in a 10-foot radius fireball (DC 13 Dex save, 4d6 fire damage). The Green Slaad may even try to maneuver a wounded Red Slaad into a cluster of PCs before it dies.
- Green Slaad: This is the real boss. It will use its spells to control the battlefield. It should use its Legendary Resistance (1/Day) to negate the first truly debilitating spell that hits it (Banishment, Hold Monster, etc.). It will use its Legendary Actions to keep pressure on the party even during their turns.
- Your Role: Describe the chaos vividly. Emphasize the precarious footing on the bridge and the terrifying, alien nature of the Slaadi.
4. Running the Battlefield (Lair & Legendary Actions)
- Lair Actions (Initiative Count 20):
- At the top of each round (on initiative 20), roll a d4 and narrate the chaotic effect. This makes the environment an active participant in the fight.
1. Gravity Shift
(Use this when you want to disrupt the party’s positioning and create chaos, especially near the chasm’s edge or on the bridge).
“A low, gut-wrenching thrum echoes from the chasm, and the very air in a 20-foot cube over [describe location, e.g., ‘the center of the bridge’ or ‘the ledge where Toriman is standing’] begins to shimmer and warp. Loose pebbles and dust lift from the ground, swirling weightlessly within the shimmering zone as gravity loses its meaning.
(To players inside the cube): Make a DC 13 Strength saving throw. On a failed save, you are yanked helplessly and tossed 10 feet in a random direction (roll a d8). You might be slammed into a wall, pulled into the air, or dragged perilously close to the edge of the chasm before gravity violently snaps back to normal at the end of the effect.”
2. Unraveling Reality
(Use this specifically to threaten anyone standing on the makeshift bridge).
“A high-pitched, ringing whine fills the air, and a 10-foot section of the stone and metal bridge ahead of you flickers violently. Its form becomes a translucent, shimmering afterimage of itself, like a memory made of smoke and regret.
(To players on that section): Make a DC 13 Dexterity saving throw immediately! On a failed save, your feet pass through the ghostly illusion as if it were mist, and you plummet into the darkness of the chasm below! On a success, you scramble just in time to a section that remains solid, your heart pounding as the bridge shudders and reforms behind you.”
3. Portal Snap
(This is a great way to apply unavoidable damage to a single target, especially a spellcaster concentrating on a spell).
“With a sound like tearing silk, a fist-sized, shimmering rift in reality snaps open in the air right next to [PC’s Name]! For a split second, you see a nauseating glimpse of the roiling, colorful chaos of Limbo. Before you can even flinch, the portal implodes with a deafening CRACK, unleashing a focused blast of raw, concussive force directly into you.
(To the targeted player): You take 1d8 force damage, no save, as reality itself strikes you.”
4. Psychic Cacophony
(Use this to disrupt the party’s focus and make their next actions less reliable).
“The air becomes thick with a sudden psychic pressure, and all of your minds are flooded with an impossible noise – a cacophony of croaking whispers, the shifting, illogical geometries of Limbo, and the sound of your own thoughts shouting in alien voices. It’s a struggle to focus on what’s real.
(To all players): Everyone, please make a DC 13 Wisdom saving throw. On a failure, your focus is shattered by the overwhelming mental noise. You have disadvantage on the next attack roll, saving throw, or ability check you make before the cacophony subsides at the start of the next round.”
- Green Slaad’s Legendary Actions (3 actions per round):
- Use these at the end of players’ turns to break up their momentum.
- Leap (1 Action). The Slaad jumps up to half its movement speed without provoking opportunity attacks.
- Claw (1 Action). The Slaad makes one claw attack.
- Chaotic Lash (2 Actions). The Slaad lashes out with raw chaotic energy at one creature it can see within 30 feet. The target must succeed on a DC 13 Wisdom saving throw or suffer one random, minor condition until the end of their next turn (roll a d4: 1=Blinded, 2=Deafened, 3=their speed is halved, 4=they can’t speak intelligibly).
5. Key Environmental Factors
- The Chasm: A fall is 40 feet (4d6 bludgeoning damage). Climbing back up the jagged rock walls requires DC 13 Strength (Athletics) checks and uses up a character’s actions, effectively taking them out of the fight for a few rounds.
- The Bridge: It’s difficult terrain. Remind players that any character who takes damage while on the bridge must succeed on a DC 10 Dexterity saving throw or fall prone (or off the edge if they fail badly!). It can be attacked and destroyed.
6. Escalation & End Game
- When the first Red Slaad dies, describe the fiery explosion clearly, giving players a chance to react if they can. The remaining Slaadi might fight more fiercely.
- If the party focuses down the Green Slaad and it gets badly wounded (e.g., under 50 HP), it is intelligent enough to know it has lost. On its turn, it might use its action to cast Plane Shift, croaking a final curse as it vanishes back to Limbo, denying the party a final killing blow and creating a potential recurring nemesis.