Inside the volcano again, the party hears a large battle being waged deeper within the caverns. The party sees a squad of devil legionnaires hack a group of zombies to pieces then rush around a cavern wall. Investigating, the party finds the zombies had come off a tram hanging from the volcano ceiling. Peering around the corner to where the devils had rushed off to, the party sees a massive portal leading into the primordial chaos, devil forces pouring in, a massive undead force fighting them back.
Devils coming from the primordial chaos didn’t make any sense to Daelock. Deciding that mystery could wait, the party climbs aboard the tram and begins to ride it towards the stalactite. Halfway there, the party spies a pair of vrocks flying towards them. As the vrocks drew closer, a trio of bone nagas fly out of the stalactite and begin racing towards the tram. Just as the party Is about to attack the bone nagas fly overhead and engage the vrocks, coiling around their wings, crashing them into the lake of lava below.
Perplexed, but thankful, the party continues riding the tram, noticing a fiery figure look at them through a large glassteel window in the stalactite. Stepping off the tram, the party soon learns the stalactite is some sort of prison. Various undead creatures line the cells, many howling and trying to break out when they sense the party. A cry for help is heard further into the prison. The party rushes to investigate. They see Kathra hanging from a prison wall, one of the zombie helmets adorning her head. The party fears are confirmed when the remove her helmet. Whatever process created the hoardes of zombies in the city was working its magic on Kathra. Tavar performs a ritual in an attempt to halt the transformation, but it only successful in slowing it. Kathra, still having control of herself for the moment rejoins the party.
Outside Kathras cell, the party notices a skull above an archway that they don’t remember there before. A thrown dagger confirms it as a naga spying on the party, which retreats back into its hole. Continuing through the halls of the prison, the party finds another skull, this time above a doorway. Voices are heard within the room, the skull telling the party to wait a moment. Not about to let a trap be set for them, the party begins to pry open the door to the room. A heating conversion is heard as the door slowly gives way, and as it finally does, a naga nearly flies into the group. Agitated it curses the party and flies off.
The large fiery figure stands with his back to the party a large cloak obscuring him. It draws power from a pair of obelisks, looking out onto the portal that had opened into the volcano. Realizing it is attempting to close the gateway, the party holds their attack until he is finished. The figure introduces himself as Nebnensoel, an immolith and guardian of Underfortress. It turns around displaying it’s form, a fiery swirling vortex of tortured souls. The nagas in the room fly into the vortex and Nebnensoel prepares to attack. As Nebnensoel steps forward, the party sees the motionless body of Lucif chained to a small altar, one of the zombie helmets adorning his head.
Nebnensoel calls to Kathra, offering to her the soul of her husband if she helps eliminate the party. Thanks to the ritual perform on her earlier; she is able to hold onto her humanity just enough to stay out of the fight. A pair of boneclaws burst forth from statues and the battle commences. Shortly into the fight, Lucif awakens, and is able to call his sword to him, breaking his chains, and joins the fray.
During the fight, the pair of obelisks momentarily take control of various party members minds. Learning that amulets worn by the bone nagas protect them from it, Tempest is able to snatch one right off the boneclaw’s neck to help protect the party. Nebnensoel is fell but his spirit transfers into the bone nagas empowering them. After the boneclaws and the obelisks are destroyed, the prison begins to shake slightly.
The ghost of Kathra’s husband appears. Kathra walks over to it as her body crumbles to the ground and her spirit embraces her husband. The ghost offers its hammer that Kathra had in her possession to Buzart, who accepts. The prison begins to shake violently at this point, blast those load barring villains. The party grabs any loot that looks substantial and begins to make their escape. Before they can manage to make it back to the tram the stalactite breaks off from the cavern roof and falls into the lake of lava.
Traversing the prison walls in the now upside prison while dodging escaped undead, the party rushes to the outside of the prison and climbs upward as the quickly sinking prison floats near the shore. Using some ice magic to cool a patch of lava and Buzart’s recoil shield, the party is able to launch themselves onto the shore. The party is able to pry the helmet off of Lucif, who has been visibly changed by whatever happened to him. his eyes now showing a hint of infernal. When asked about his appearance and some of the strange magics he used in the past fight, Lucif calmly explains that his familiar had offered to make a pact with him for the power to escape, although the imp seemed to have buggered off leaving Lucif with a rather raw deal. The party is disturbed by this pact but move past it.
Making their way to the vault doors, the party notices and inscription on the vault key. Believing it to be a puzzle, unsolved by Tannis’ group, is what caused the undead horde to wake. In an ancient dwarven script, one side of the oversized key appears to read, “Flame Gold”, the other “Knowledge Mountain”. Puzzling over this, buzart notices a word burnt into his glove from when he grabbed the key. It’s backwards but he can make out the word “Silence”. He looks back at the key, realizing in this ancient script, the word mountain makes the word Silence when flipped over, likewise “Flame” became “Power”. Grabbing the two ends of the key and twisting the two phrases now read, “Silence is Golden” and “Knowledge is Power”
Inserting the key into the vault door and turning, the vault opens rather quietly. Inside they find a large collection of small chests holding gold coins and gems, but it looks like someone had already taken off with a number of chests. Inside the vault the party finds a handy haversack with a pair of crossbows latched to it. The party’s assumption that it belongs to Tannis are confirmed when they search the contents and find a chalice and a short journal.
The journal tells about Tannis plans directly preceding this excursion. He had spent some time seriously injured after acquiring the second the last item required for a ritual, during which his companions had discern the location of the last.
As the party is packing their loot up a voice calls to them. A tiny pyramid sits upon a pedestal, a image of a tiefling floating above it introduces himself as Karavakos. He is in the middle of a sentence when Buzart charges the pyramid sending it crashing against the vault wall. Annoyed, Karavakos decides to skip the formalities and traps the party within the pyramid.
The party is engulfed in darkness. The floor gives out below them and the feel themselves falling. They feel themselves fall into water, and when they surface they find themselves in an ocean in the middle of a storm. In the distance they see an island, and after hours of holding on to dear life they finally reach shore.