Descent into the Undercroft: Mongrels, Manuscripts, and the Spider's Fane

The party ventures deep into the Undercroft of the Strider to recover a stolen ink ribbon for the library curator, navigating past mutated mongrel folk workers, hostile corrupted worshippers of the Sinister Six, and increasingly disturbing tunnels covered in religious iconography. After a brutal combat and the recovery of the ribbon plus mysterious manuscripts, they press deeper into spider-infested passages and pass through the threshold of a Fane.

1. Argyle proposes a Pact of Gaius — a magical constitution preventing signers from harming each other or the heart — to root out spies. Discussion reveals it takes a full day of casting per person; the group defers but Argyle arranges to learn the Oil Slicked Walls ritual from the Scale.
2. The party gifts one of their captured Sable & Sons laser weapons to Radiant Arms for R&D, effectively committing corporate theft/espionage trade secrets in exchange for faction goodwill.
3. After resting, the party descends via a manually-operated elevator from the garage deep into the Undercroft of the Strider, heading to sub-level 12 to find the ink ribbon for the library curator.
4. They encounter mongrel folk — slip-affected humanoids mutated by unprotected long-distance slip travel — working on a lubricant platform for the Strider's legs. Argyle identifies them via occultism (slip exposure/mongrel folk phenomenon).
5. Johnny negotiates with Marin (Maranthorn), a bird-like mongrel folk worker bound by predatory debt contract to a Harlequin (18,000 gold and climbing). Marin directs them to an unlit 'forsaken sector' past acid vats where people hoard things that don't belong. Johnny promises daily sandwich deliveries.
6. In the forsaken sector, the party finds heavily mutated mongrel folk speaking a strange chittering dialect of Earthram. One wears a horn amulet connected to the Sinister Six's iconography. They are spotted, a fireball is launched, and combat begins.
7. Brutal combat against two Oculum (spellcasters), two Oris, and two Manus creatures — all unholy, with dimension door, fly speed, infernal wounds (bleed), and infernal fever (disease). Johnny is infected; multiple party members bleed heavily.
8. Argyle turns the tide with Holy Water + Divine Wrath, crit-killing both Oculums and an Orus. Anzu freezes the remaining Manus creatures. Johnny finishes the last Orus with an Invented Vulnerability + summon spell combo.
9. Looting the bodies: Anzu identifies two 'Perfection's First Step' manuscripts (completable into scrolls of Unbreaking Wave Advance, a focus spell sourced from a Sinister Six patron). They also find a mongrelfolk tincture, a skull key, and a parchment with Earthram-adjacent runes.
10. Argyle casts Locate (ink ribbon) — it points north. The party navigates hallways covered in disturbing art (horn iconography, perfection/ascension poems, stick figures dancing around orbs). They find a stinking barracks and recover the ink ribbon from a pack, along with the skull key and runic parchment.
11. Continuing deeper, the party carefully maneuvers through dense spider webs while skittering sounds intensify around them. After ~15 minutes of careful navigation, they feel themselves pass through an air curtain — they have entered a Fane. Session ends.

Cliffhanger The party passes through an invisible barrier — an air curtain — and realizes they have entered a Fane, deep in the Undercroft of the Strider, with skittering sounds all around them. A spider heart (and whatever lurks within) awaits next session.

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