((OOC: Please forgive the slight godmode of the creature on my end! Tell me if anything's out of line. Also, you have permission to kill Nikias if his last attack has no effect.))
It was good that the tentacle did not linger in the material realm when Nikias had stabbed it through, though his arms shook from the creature's impact when it charged through his staff. It also confirmed to him one thing: The creature was powered by some kind of magic. Either Nikanoru was enchanting it from afar, or he'd done something to it for it to emit some kind of transformation on its own. He recalled how it had mutated in the first place, when the mother (no, the mother's corpse) had seen her child - was there a connection?
And now there was a body, the mother's body again, clawing out her child - to get at her? Briefly alarmed, Nikias made a move to step forward, but saw that no, there was no bloodlust in her movements - she was trying to free the child! At this, he decided that there were greater forces at work than he could know. Did the souls trapped in the beast have some measure of free will?
Before he could muse further on this, he detected a... a glowing? From where he was standing, the monk could see that there was some strange illumination behind the corpse-horror, but there was no time to digest this knowledge as the right side of the creature was encapsulated by this light, and mutated even further. He stepped back, holding his staff as his mind raced for options. How could he stop this transformation? Something was going on behind it: either a spell cast on its back, or something totally different. Whatever it was, he had to get behind it.
No easy task, however. He could see that the creature was sporting many more legs... no way for him to unbalance it. If it kept this up, surely it would overpower him! His first priority was the girl, however, and now that she was free, they had a chance to escape. He ran towards her, holding out his hand for her to stand... and then saw in horror the claw impale her, hold her in the air in what would no doubt become a fatal position if it had ruptured any internal organs. If he could defeat the monster, there'd still be time to save her if he got her to some form of healing magic... but then the creature sprouted even more tentacles than before, and he was occupied with defending himself once more.
His reflexes, as before, were a vital asset. With lightning-fast speed, he beat off as many as the tentacles as he could with his staff, but he was not able to make any deadly lunges, and there were too many at once to defend. He grunted as one mouth sunk in his right shoulder, another at his ribcage, another on his thigh, and one narrowly missing his head as he dodged away, taking a bit of his hair with it. Extremely painful, and the mouths weren't letting go! He wanted to black out, but he knew his life would end if he did. Instead, he used that pain and channeled it into rage. Struggling to be free of the mouths, he ran towards the creature and executed a diving forward-roll on the wet ground, using the momentum to free himself.
The fluidity of the roll was marred by both the wet ground and the hold of the tentacles, but with a sickening rip the monk managed to free his flesh at the shoulder and leg. A swift, devastating downward chop was hopefully enough to dissuade the head at his ribcage from holding on, and he reached for his staff on the ground to swing at the remaining heads to keep them at bay, before charging at the monster again. He leaped and grabbed onto the arm holding up the girl, and knowing he was in danger from the other claw if he lingered, vaulted over it and rolled on the ground again, before standing up and turning to face the creature's back.
He realized it was only a matter of time before the tentacle heads caught up with him, and so he took in the visual information as fast as he could. A dark glowing rune pulsated on its back, which was likely where it was getting its power. He was hardly a student in the arcane, but he thought that if he could disrupt it somehow, perhaps the magic source would be eliminated... or at least dissipate its power somehow. A gross assumption, he knew, but it was a chance he needed to take.
But he'd already dropped his staff... quickly, he looked around for something to attack the rune with. There was a rock at his feet, but he decided it was too small to penetrate its flesh at this distance. Suddenly, he realized that to his left was a bale of hay with a rusty-looking pitchfork stuck inside of it. An unwieldy weapon, he decided, but an effective spear in a pinch. Not much time to use it, however... already, the creature was turning around, and the heads hung in the air hungrily, ready to strike.
The young man made his choice. A few steps brought him in range of the pitchfork, and he grabbed it, charging the monster with a guttural roar, sprinting as fast as he could with the farming tool crooked underneath his left arm. There was no time to swing at the heads, and though he dodged some of their attacks he could feel their mouths tearing at his clothing and skin, though the speed of his movement meant that they could not hold onto him this time. The claw on the creature's left arm swung towards him, but he easily ducked and rolled underneath its slow lunge, and he was once more behind the undead horror.
The battle-ravaged monk knew that he only had a bit of time before the tentacle heads managed get around the creature's arm and torso, and so he summoned the remaining vestiges of his strength. There wasn't much left; by now, Nikias was a wreck. His torn scalp bled over his bad eye, the clothes on his back were torn, muddy and sticky with his own blood, and he could feel his body ravaged by bite wounds, which would undoubtedly leave scars if he survived this encounter. His remaining hope - that by disrupting the rune, he could terminate the creature's power and save the girl - was all that carried him now.
And so he drew back his arms, ready to lunge. His vision was red, there was a dull roar in his ears that blocked out all hearing, and somewhere in him he knew he was screaming at the top of his lungs. With a monk's concentration, he drew on what little untapped strength lay inside of him and plunged the pitchfork into the corpse-beast's rune-scrawled back, before pulling it out slightly and thrusting it upwards, attempting to rip off as much of its skin as he could.
And at this, he lost his balance. He fell backwards and hit the ground, barely remembering to slap his hand against the muddy road to dull the impact as he did. Silently, he willed himself to remain conscious. If he blacked out now, he'd be dead, and he needed to stay awake... needed to stay alive... for her, for the girl... for her...