Fungus and Rot

Awakening after our rest we went back to headed back to the main corridor and headed east. We came upon a pond of sorts with 4 dead bodies, 3 large rats and one giant frog with burn marks across their bodies. Braylin enter the room and just a second after his first step i realized the fungus on the wall was one of those that emits an electrical shocks when water ripples and sets them off. I informed them that only cold spells could control the fungal reaction. We decided to head to another door down the hallway rather then spend time disabling the fungus.
 
Entering the next room we were greeted by 4 large frogs. Immediately one fired its tongue at thrall and sucked him towards its gaping mouth. I charged ahead grabbing my shortsword and thrust it mightily into the frog to my right. Carter sent bolts of energy at another and thrall smashed the final foe. Among the dead frogs were three sarcophagi which upon further investigation it was determined that they were likely the grave of Eden Marsh, Matteo Reed and Lewis Dean. In the corner was a nest that had a half devoured body and with a gold ring with an aquamarine stone which Kharos determined was a magical ring that helps a person to swim.
 
Thrall busted open the another door in the room and head down a hallway which bordered the other side of the room with the glowing fungus. at the end of the hallway was a large room with a wheel attached to large chains hanging from the ceiling. water remained up to our thighs. Several animated skeletons were spread across the room and began there assault upon us. Thrall msahed the first foe and I knocked a blunt arrow only to have it miss the target and sink into he water below. Mueller Entered into the room and called upon our mighty G-d and holy energy burst from him destroying the undead in a single blow. Mueller stepped forward and sunk into a pit of water and thral reached out doomhammer to gather him. I equipped are newly aquired ring and made my way acrss the under water chasam. Eventually we all were standing near the wheel. Braylin took bones and braced the wheel in case something triggered.
 
We headed out of the watery area and back to our west until we came to a windy room with a strong stench. Thrall entered the room and human remains ambushed us. Thrall swung and crushed the body and it exploded in a cloud of foul gas. Kharos yelled out "dont let it hit you! You will turn into a zombie!" I fired an arrow striking true and shortly later I landed a blow with my shortsword exploding another. The amount of undead we have seen is overwhelming. What happened here? We searched around and in the crevices and found several backpacks. In one we found a map with notes highlighting the crypt of ever flame and a note looking for adventurers to come for employment at the Ranger's Lament which Braylin recalled was a bar in Wayhill.