A 'scary eel creature', as described by the Troglodyte and identified by Dacien as a Kopru.
Beyond the secret door was a passage that led to an underground lagoon that seemed to open up to the sea. The lagoon was filled with scores of corpses, their heads all removed, which tainted the waters red. A cavern was visible across the lagoon from which a deep swirling purple mist emerged. Thinking themselves too worn down from the earlier battles, the party retreated to rest and prepare for what lay ahead. They tried first to leave the catacombs the way they entered, but found the entrance collapsed, with a strange smell of entrails and putrefaction.
That night, a troglodyte warband attempted to swarm the party, led by what appeared to be one of the Kopru they had heard described earlier. They were fought off and the passageway resealed. Come dawn, the party decided to clear the rest of the complex behind them before descending further. More undead and ceremonial chambers were found, including a trapdoor up into what appeared to be the Zombie Master's hut. From there, Jardek spotted a sickly looking elasmasaurus atop the pyramid in the centre of the village. The storm itself was still in force and showing no signs of abating. They retreated back into the catacombs to complete their exploration from where they entered.