After the Gorgimera attack things get very quiet at the horn for several weeks. Maybe it's all over bar the shouting, and the Posse have won?
Maybe. Let's think about this. The Evil Posse of Evil have taken over a dungeon on nebulous orders from a shadowy superior. They found a mouldy set of instructions written by a dying madman for a blasphemous ritual and have since been merrily performing that ritual calling forth an otherworldly horror that they hope to bind and coerce into their service. This is going to be fine.
The temple is wracked by a tremendous earthquake. The earth itself seems to rebel against the blasphemy being perpetrated in the Sanctum. In the Sanctum there is a horrific ear-splitting scream and for a moment a shadowy apparition manifests over the Silver Seal. It reaches out its six clawed hands and grasps at the seal, scratching and clawing. The Seal is gouged and marred. The echo of unholy laughter is heard and the apparition fades. Vetra-Kali is close at hand, and the seal is weakening!
Sam, Adelea, and Creel are struck and hurt by falling masonry as the horn writhes and shakes. Various minions are also harmed by the quake, to various degrees of disinterest from the Evil Posse of Evil. The horn is much changed afterwards, with some rooms unusable due to collapse, and with a new entrance to the third floor where an exterior wall used to be.
With every prayer, the ritual is creating a bridge to Vetra-Kali through the astral plane allowing the daemon prince to return to the prime material. From this bridge, emanations of magic and evil ebb and ﬂow, rippling through reality. One of those disturbances draws the attention of a dweller within the astral — a good celestial named Brastius Star-Feather. Brastius is a ﬂier upon the astral winds, an avoral agathion. Curious, the agathion investigates. He happens upon the rift in the astral. Seizing the moment, Brastius plunges through and finds himself high above the Caer Bryr just outside the sanctum, just as Fitch is beginning the midnight ritual.
The avoral bursts in, determined to disrupt the ritual. He flies right up to Fitch ready to attack him. Continuing to chant prayers, Fitch wheels in place and stabs the wierdy birdy creature man. His dagger skitters off its feathers.
Adelea attacks, but misses!
The Avoral attacks Fitch but misses so badly that it's briefly flat footed and Fitch stabs it, dealing some damage despite its damage resistance. It does manage to land a single blow though for a small amount of damage.
Grumblejack also misses, and he and Adelea share a rueful glance.
The posse and their minions pile in to attack the avoral, and, before it can escape to fight again another day, Fitch and then Adelea land a series of telling blows and it dies in a welter of blood and feathers.
After this experience the Evil Posse of Evil decide to surround themselves in an ablative layer of minions. The tiger, One-Eye, is staked to a 20 foot chain in the entrance to the balcony – mostly because Sam is bearing a grudge and wants it killed. This leaves Fitch unable to reach and repair the cunning fire trap he had made, which was set off during the Big Quake. Area closed due to tiger.
A wall of Creel's undead minions are stationed just out of tiger range between entrance and altar. The hellhounds and Adelea's evil horse are stationed in the room as well. It is decided not to invite Tregellan as he is “a bit unpredictable”
Day 218 starts with the dawn ritual, uninterrupted. Just before 4pm a greater mud elemental erupts into new, and very angry, life from the boiling pool.
It attacks the boggards and starts to take a toll on their ranks, although their terrifying croaks do force it back into its boiling mud pool for a while.
Cowering in his sanctum Zikomo hears the croaks and sends an animal messenger to alert the Posse, who buff up and teleport down. Adelea waits at the edge of the pool, sword drawn, as she knows the scalding mud hurts to wade through. Then it occurs to her that Hexor and Vexor can cast fly, so she gets this cast on herself and flies on over to return the mud-man to the mud from whence he came. Ashes to ashes, and mud to mud.