Think harder John!

The voluptuous aspect of the creature from the shoulders down had distracted him from her lethal nature. There should be something to do to kill it though, Kim might have pretty **** ideas of what a test is, but she wouldn't have set him against something that could not be killed. He regretted not knowing anything about banishment, exorcism or any such thing that could send this thing back where it came from.

He tried flinging the broken tip of his blade at the creature as a projectile, but it got swatted away and fell in a brazier.

"Kim! You said you wouldn't take part in the fight, but I never faced such a thing and know nothing about it. Would you at least give me some advice?" he shouted to the Silver Crane of the north who was watching the fight from afar with interest. John had an idea he would have liked to test, but it was based on powers he would rather not reveal to her. (and Moira by extension, now that they talked.)

"A true king wouldn't need any help. Try not to die and be careful of the spell from earlier, something else than your shield would have no chance blocking it." she replied sarcastically. The sad thing was that if he won he would get this damn egg and wouldn't be able to get back at her for this without her knowing it in advance.

John was about to reply something witty but the creature had leaped toward him. He managed to make an interrupting shot with his slingshot. Rather than attack him the creature just crashed on the pillar he was resting upon, just after he rolled on the side.

She had once again regained hp, getting back to 420/560 hp. Her crash had broken the brazier and some hot coals had fallen on it making it flail around. John tried to keep behind the creature and attacked with his broken sword. The first hit did almost no damage but cut one of the control tendrils on its right arm, the second was a direct stab under her armpit to reach in her chest.

60 dmg crit (weak spot : crippled.)

He also saw the burning coals and the fall do some dmg but as soon as the black liquid started flowing over its wounds it's hp recovered getting to 390/520 hp. His crippling attack had reduced its max hp, which was encouraging.

John could probably have landed one other blow before the creature got to its sense (if it had any), but he preferred running away and hiding behind a pillar using stealth before it could see where he was. Once safe he used his life infused Alter Body three times on himself, removing the bleeding effect and recovering his full hp. (he got a crit on one of the spells) Getting back to full had reset the counter on the spell, making it possible for him to use it later.

John remembered the effect that his life spell had got on the creature, giving the host some health had made it slow down and distract the spawn. Would other biological reactions have the same effect?
While looking at a way to optimize his next move he saw something he never noticed. He could actually infuse Arouse with two elements he had mastered. The Lightning one was making the target feel pleasure from electric stimulation and get more powerful orgasms. The Life one was making the biological signs of arousal more marked and made the target get ever so more horny from physical contact.

He got the small vial of his cum that he had brought to school for his panty hunt and fired it at the creature with his slingshot. Having it explode on the body of the monster gave him the 50% discount just in time for him to cast six charges of Arouse three infused with Life and the other with Lightning.

He was missing a few of his tools, having left them in the saddle bags of his bike but he had the pickaxe in his inventory. He was ready for his attack. On its next leap John cast a lightning Magic Projectile, the creature began to scream from pleasure as the electric bolts hit the chest of the host.

John quickly noticed that while the hp of the creature was constantly ticking up, the small burns made by the coals remained. Using the confusion that he could create by having the host feel pleasure, he began using his slingshot to fire hot coals at it. (the heavy leather gloves were letting some heat through, but without it he couldn't do that.)

This couldn't last forever and soon enough the creature leaped forward and crashed just in front of John, trying to cut his neck. The machete he had got out as a paring blade did little to stop the heavy pincher. The blade bent and despite him also using Move on the claw to deviate the blow it only managed to prevent it from cutting. He managed to stab the host before taking the hit. The crushing blow and the inhuman strength of the creature sent him flying back a few meters.

25 dmg
-45 hp

The creature was back at 460 hp but its max health was only 508 now. John fell down on his feet thanks to his cat step boots.

John had now only 60 mp left, he still had one recharge, but didn't knew how long the fight will last.

John mindfucked the host using his spectral dick style Move and while she began twitching with ecstasy and the parasite on her shifting and moving uncontrollably he striked. He ran outside of the line of sight of the creature and slammed a lightning Charged Strike with his pickaxe in her back.

140 dmg ( sneak attack, charged strike)

Of course his luck ran short, the point of the pickaxe remained stuck in her thorax and the spawn snapped the shaft in two with its claw. (barely missing his head, the edge of his hood got clipped)

John used a lightning Magic projectile on the creature, distracting it for a moment. Using Move he recovered the red hot broken blade from the flames of a nearby brazier and sent it flying, staving the host in the throat.

80 dmg (weak spot, internal dmg, elemental weakness.)

She began clawing at the hot piece of sharp metal that was killing her to remove it, but in her situation only managed to cause more dmg.

90 xp

Soon the body stopped moving and the mass of black flesh started bubbling. The hard shell of the unique eye on its head started cracking, the flesh of the host was bloating and blackening.

In a massive burst that sent flesh and bones fragments flying everywhere the creature exploded. John hurt by some of the biological shrapnel let out a sigh of relief at having finally defeated such a thing.

As the mist of blood dissipated he saw with horror that the creature was still there, the bulbous head was still there, over a thin body covered in a swirling mass of tentacles and maintained in the air by two pairs of insect wings buzzing in its back.

The eye that appeared under the black shell that fell away was a true maelstrom of colors, most of which didn't actually exist, making it impossible to look away and unbearable to keep looking...