It ended up being almost fortuitous that the party had ended up so far behind schedule from the monster girl and bandit encounters, as if they'd been more on route, they may well have decided against investigating the dungeon entrance they'd found in favor of pressing on to the town, or even overlooked it altogether as they focused on the destination ahead of them. As it happened, they were already running behind, but not so far behind that investigating what was almost certainly a source of corrupted magic would throw them even more off course.
The almost was dropped from the description when Gabrielle focused herself and sensed all the dark magic flowing through the area, with the dungeons as its source. She couldn't sense anywhere above ground where the energy had driven a mamono dark or savage, but the dungeon itself was likely filled with them, and that was not something they wanted to have coming up so close to a village that, according to the map, had no guards.
They opened the entrance and started down the steps. To Cassandra's relief, the path wasn't near as narrow as the previous dungeon, seeming more like steps in a building than in a cave. When they reached the first room of the dungeon, they knew that this was going to be a bit of a difficult time. Instead of having several floors, this dungeon just seemed to have two, with several-for want of a better word-cells in the walls, all closed up when they entered, but opening once they were in the room fully.
It was only three at first, though the first to actually exit the cell caught them off guard, opening behind them. They didn't notice it until the long, warm, wet, pink tendrils of the mamono ensnared Gabrielle and pulled her in. She was a Ropa, a parasitic monster girl. Her host was what looked like a farm worker girl, likely having been out to gather material when she was bound to the monster girl. Now her eyes were glazed over, unthinking, as the dozens of tentacles that now sprouted from her body did the work.
They wrapped around Gabrielle, undressing the white mage and burying four of the tendrils inside of her ass, forcing her walls apart and stretching her painfully as two tentacles held her legs as far apart as possible. Gabrielle tried to cry out, but when she did, three more of the thick tendrils forced themselves into her throat, throbbing as they pumped into it, evidently able to feel pleasure from all parts of the tentacles. One tendril wrapped itself painfully around her balls, which would prevent her from cumming as she was fucked, and another, smaller tendril pushed into the slit of her member, causing her entire body to twitch and spasm.
The others wanted to help her, but they had more immediately lethal issues to deal with. The second mamono out and about was eight feet tall, with lovely dark skin and bull legs. She had a matching bull's tail, ears, and horns. She had nothing but tight leather straps covering her large chest, broken shackles on her wrists, a massive battle axe in her hands, and a look of excitement and fury in her eyes as she charged towards Carver, likely targeting the physically largest of the ground.
Carver lifted his shield, but the force of the charge still pushed him back to the wall. He only managed to get the Minotaur off of him with Cassandra's help. At the same moment he pushed with his shield, she struck the monster girl's legs, throwing her off balance enough for Carver's push to send her back a little ways. The Minotaur gripped the handle of her axe, glaring at Carver and Cassandra, nostrils flaring as she prepared to charge again.
That just left Oliver to handle the third mamono out in the open, which was rather unfortunate, as he was far better at picking opponents off when they couldn't spot him, and wasn't sure how exactly he would do against a brick wall of a fighting monster girl like the one crawling out of the wall to face him now. Her body seemed like that of a normal human, long dark hair, pale skin, small breasts, but unlike most, would never be mistaken for one.
From the knees down, her legs vanished into the body of a massive black shelled spider. It was like a centaur's top half had attempted to step out of its horse body, but with the horse replaced with a giant, venom dropping spider body. Though Oliver did not know the name, he would later be told she was called an Atlach-Nacha. She smiled cruelly at Oliver, who immediately fired his crossbow. His standard arrows glanced off her spider body, and her human bit would be protected by the spider legs whenever he attacked. He wished he'd loaded the bolts instead.
Gabrielle squirmed in the grip of the Ropa's tentacles. Her arms were bound behind her back, and without her staff she couldn't cast her shield bubble spell, at least not without an amount of focus she would never be able to manifest with tentacles forcing themselves deeper into her body every second. They were so deep inside of her ass she feared they would meet with the ones raping her throat, but the ones assaulting her cock were the worst, if only because she couldn't cum from it and she was steadily losing her mind from this.
The Ropa just moaned from this, tendrils throbbing and pulsing in delight, making Gabrielle scream and choke around her tentacles as they pumped thick, hot goo-like cum into her body from every side. Gabrielle feared she would explode if this kept going, and if her stomach didn't, her balls certainly would. Gabrielle did all she could think to, put what little focus she had into generating an aura of holy magic. This was, the ropa would be forced to absorb it as she fucked Gabrielle. Her next climax would cure of her the infernal energy, making the monster girl inert and the host girl free. Gabrielle just hoped the ropa's next orgasm didn't knock her out with it.
Cassandra impressed Carver by being able to actually stop the minotaur's charge. Her feet planted and her hands gripping the monster girl's horns, her gathered chi let her turn the minotaur's strength against her before she was rammed into the wall. She forced her back, where she was met with a slash from Carver's sword. When she turned to strike him, she was struck in the shoulder by Cassandra's bo and knocked to the ground.
Granted she got right back up but once knocked to a ground a mamono was easy to knock down again. Each time it took a little more effort until finally she was weak enough for Carver to hold, ramming his cock into her from behind. The minotaur yelped as her ass was stretched by the heavy knight's member plowing into it mercilessly, a combination of adrenaline and anticipation driving him to abandon any slowness and utterly pound her, Cassandra doing the same, forcing four fingers into the bull girl's pussy and moving on to fisting her moments later, a combination of chi and natural strength making it a combination of pleasure and pain that the tough mamono was sure to succumb to.
Oliver was having a significantly rougher time with his monster girl. The Atlach-Nacha's spider legs carried her quickly, leaving Oliver no time to strategize. He'd nearly managed to put a dagger in her shoulder, but the spider limbs had blocked it, and then cut his clothing from his body. A single cut would infect him with a cocktail of toxins that would drive him to lust certainly, along with paralysis so the spider girl would rape him and perhaps death if she felt like a snack when she was done.
Oliver's handaxe saved him. He managed to cut the end off of a spider leg that had nearly stabbed him. The pain made the spider girl recoil long enough for Oliver to load bolts into his crossbow and fire, pinning one of the spider legs to the ground. This done, he was able to pin to the other three that were in front,, leaving only the ones that couldn't reach him.
He walked right up to the now immobile spider mamono. She hissed and spit, but could do nothing as Oliver climbed onto the spider body, hilting himself inside of her pussy. He reached around, groping her small breasts and toying with her clit, hoping to more quickly sate and be done with the damned spider girl. Unfortunately, he doubted he'd be done even when he was, as the next cells were already opening up.