After defeating the skeletons, the party discovered that the back of the ogre’s sarcophagus was hinged. There was an octagonal indent which Tostig assumed was some type of key that would unlock the hidden door.
Venturing back past the entry shaft, the party encountered two archways across from one another. As they investigated the archways, an unusually fast and capable zombie attacked from the room on the right. Once battle had begun and the companions were focused on the room on the right, a spellcasting ghoul attacked from the left-hand room.
Once the undead were defeated, the party continued on until the found what was obviously the high priest’s chambers. On the back wall, they spotted an eight sided sapphire necklace, below which was a riddle inscribed on the wall with a line underneath for an answer. Eldwinn reached up and grabbed the necklace, and at the same time his hand passed right through it, three minor demons (dretches) appeared and attacked the party. While they quickly figured out the answer, nothing they did to inscribe the answer seemed to work. Finally Adran thought about inscribing the answer in blood. The amulet fully materialized and they were able to take it.
Deeper in the Pit, they found the shrine of Imbrindarla and under the gaze of her idol was a glass coffin-like box with no seams or other openings which contained a large tome. The outside of the glass box had an octagonal indentation that the party determined was the exact size and shape as the sapphire amulet. Placing the amulet in the indentation opened the box and Keegen laid his hand on the Serpin Lexicon, the unholy tome of Imbrindarla. Paging through it, Keegen was amazed at the powerful rituals and spells both divine and arcane penned in the tome and looked forward to copying these powerful magics.
Past the shrine, they came upon a strangely shaped room, which Keegen quickly identified as a summoning chamber. What the other members of the party did not see was that Keegen looked into three outer planes because he carried the Serpin Lexicon. In an effort to show how powerful the tome was, Keegen looked into the landscape of the Abyss and called three dretches over the boundary. Once the dretches were defeated, the party pulled Keegen from the summoning room forcefully.
Realizing that they hadn’t found the famed “treasures” of the cult of Imbrindarla, they made their way back to the ogre’s sarcophagus and they found that the amulet opened the way to a tunnel leading to an underground lake. They had no way besides swimming of traversing the lake, so they split up and went searching the chambers already visited for any way past the waters. Soon Keegen found a magical feather token, while he initially said it was delivered by the pack rats, he actually found it in the slave pens (and was seen by Adran through the viewing mists).
With the party now suspicious of their little friend, Keegen then went on to explain that there were beings trapped in the Serpin Lexicon who spoke to him and gave him advice. He used a ritual to turn the lexicon into one of the patches on his robe of useful items before they used the feather token to conjure a swan boat on the underground lake.
Following the underground lake, they came upon an island filled with urns and chests. As they approached the island, a skeleton burst out of the water and latched onto Adran’s leg. The skeleton began draining blood even as the party pounded it with spells and steel. Soon the skeleton began growing ligaments, flesh and muscle on its bones and in less than thirty seconds had drained enough blood to change into a vampire. Luckily for the party, they had done enough damage to reduce the vampire to mist, which glided over to Keegen and disappeared into his robes.
Knowing now that the Serpin Lexicon had places for fiends and other entities, they party assumed that the high priest – now a vampire – used the evil tome as its coffin. They gathered the treasures of the cult and made they’re way up to the light of the sun. And in the daylight, burned the Serpin Lexicon. Creatures from the Abyss and Baator appeared and were banished back to their home planes until finally, the high priest of Imbrindarla appeared in full regalia. Under the light of the sun, he began to burn and soon was reduced to ash. Keegen was heartbroken at the loss of the spells inscribed in the tome, but realized that carrying a vampire around may not have been the safest choice.