Background
The Brotherhood of the Scarlet Palm is a cult of demon worshipers, seeking to contact Hell in order to negotiate with demons for earthly power. It was not long ago that they first began meeting in secret under the leadership of a disgruntled merchant named Vladislav Mikhailov, who, upon facing numerous failed business ventures, decided to summon a demon in order to guarantee him financial success. However, Vladislav's resources were limited, and he did not have access to arcane knowledge, having to cobble together his notes from a few scattered texts. This resulted in his cult performing a few botched and ineffective rituals, but they remained desperate enough to keep trying.
Through some miracle, Vladislav finally managed to contact a demon - a pit fiend by the name of Ag'draluun the Tormentor - a few days ago, and set to summon him into the mortal plane to discuss a deal. He set a protective circle over the ground, burned some candles, and read some incantations. Through this, Vladislav was able to open a portal to Ag'draluun's domain - but the ritual did not work according to plan. The cultists were able to form a portal, but not one big enough to accomodate such a hulking creature. Now, Ag'draluun is trapped partway in and partway out of the portal - and the cultists are in the middle of trying to get it to open the rest of the way.
The Encounter
The party should come upon Vladislav's circle to find three cultists standing at the points of a triangle inscribed on the ground, surrounded by a rim of candles that burn with violet flames. They have their heads bowed low and are chanting. At the center of the circle, suspended in the air, is what appears to be a rift in reality. It appears like a hole in a tapestry opening into an orange glow, but floats in midair above the ground. The portal gives off an intense heat, and flames can be seen flickering around it. Every so often, a huge clawed arm, covered in black scales like cracked magma, emerges from the portal, flailing around, and muffled cursing in Infernal can be heard.
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| One square equals five feet. |
There are five other cultists gathered before the circle, watching; Vladislav stands behind them, flipping through a book at a hurried pace. It should be obvious that he is the leader; for instance, he may wear differently colored robes than his underlings.
Additionally, there is a circle of pillars gathered around the circle. These have the Concealing, Full Cover, and Impassible terrain tags - they provide full cover, cannot be passed through, and creatures hiding behind them have Advantage on Stealth checks.
Enter Action Time. The cultists will be too busy with trying to correct the ritual to monitor their surroundings, giving the PCs the opportunity to sneak up on them; they will thus not attack if they are not alerted to the presence of intruders. However, if the PCs do draw the cult's attention, Vladislav will order the cultists to attack.
Vladislav has the stats of a cult fanatic; his underlings have the stats of cultists. He will start by sending the five cultists staying back by him to ward off the PCs while he tries to lead the ritual. The three cultists gathered around the circle will remain where they are, continuing to chant. If two or more cultists are killed or incapacitated, or if Vladislav is directly accosted, he will enter the fight.
As long as the portal remains stuck in its partially open state, the three cultists at the circle will spend each of their turns chanting. When this happens, roll a d20 - on a roll of 11 or higher, the cultist successfully performs a chant. At the end of a round, if any cultist succeeded on the chant that round, the portal flickers and begins to widen. If no cultists succeeded, the portal remains in its current state.
Ag'draluun is trapped on the other side of the portal, unable to pass through. He cannot move across it (it's too small), and his Fear Aura will not affect creatures on the other side of the portal; however, he will reach through and make an attack with his claws at any PCs within five feet of the portal. If the portal is widened three times, it opens fully, summoning Ag'draluun into the world. He is quite angry that the summoning was performed so poorly, and is just as wont to attack the cultists as he is the PCs - but he won't hesitate to attack them either, if they're in range!
If all three cultists around the circle are killed or incapacitated, the portal winks out of existence. Ag'draluun's arm will be caught outside of it if this happens, causing it to be cut off; it falls to the ground before burning away into cinders. Alternatively, you could make it persist so that the PCs could retrieve it - the arm of a demon would surely have interesting alchemical properties.
Further Developments
If Vladislav is alive when the portal closes, he will flee the scene. He may become a recurring antagonist to the party - but perhaps a less than effectual one, unless he discovers more useful arcane knowledge. Either way, he will leave behind his books, which contain notes on a few rituals cobbled together from different sources. Some of this information could prove useful if the PCs need to research a ritual. Also left near the portal are his bags, containing 150 GP in gold and jewels and a scroll of Tasha's Hideous Laughter.
Ag'draluun might make for a recurring antagonist as well. Even if the portal was closed on him, he now knows the party, and will blame them for the loss of his arm, seeking a portal or a more competent summoner to re-enter reality so that he can enact his vengeance.
And if the portal was opened and the party somehow survived...well, they now have released an incredibly powerful demon upon the world, and can expect to deal with the consequences!
I like it and may use it in reverse. The adventurers are gearing up to go banish a stygian monster with a ritual. I like the idea of having a specific shape (e.g. triangle) of chants of which each needs to succeed. They may get interrupted by the cultists in a similar manner.
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