Principle characters involved in this story, for reference:
Zona, my character. Described above. Class is based around mutations.
Hilda, MemeD's character. Class is based around mutations and eating other mutants.
So, MemeD went on a trip to Japan for Comitek, and thus was absent for a few weeks. They and the DM agreed to fluff this as them sneaking off to a certain in-universe location...which we find out a few sessions later is the settings equivalent of R'yleh / Azathoth's Court. Oops.
Meanwhile MemeD and gm have been conspiring secretly.
Weeks later. Big chapter climax time: the settings equivalent of the godhand descend on the island we're stuck on. Start sinking it, psionically flay and liquefy tons of npc's, etc. lots of bloodpumping horror. The opposing gods also show up to hold them off, and the place becomes a nuclear battlefield as they roll against eachother with the powers of destruction. Then the not-godhand - in an act of sadism towards us - summon Hilda, who they captured and horrifically mutated into what can only be described as a hybrid between a centaur and an anglerfish.
Player actually had a JP artist friend draw a sketch of it while he was in Japan <3!
So this is pretty heartbreaking for my character. They were like sisters, and Hilda has now gone completely insane and now is preaching the flesh gods gospel on repeat and moving to eat us. I thought quickly, and went back and retrieved some of the text we had from an earlier session in which Hilda made Zona tearfully promise to kill her if she ever went fully berserk. I rewrote, abridged, and reformatted parts of it into a dramatic flashback to that scene, right as the GM engaged the brutal pvp battle.
The music he chose fit both the flashback and the battle
perfectly.
Battle starts, and Hilda lands a nasty critical hit on me right off the bat. Bites off half my body. However, despite being a borderline pacifist, Zona is fucking strong regenerative and transforming mutant (I accidentally min-maxed my build, hue). I morph my hand into an organic pilebunker (think the Xenomorph tongue, but shooting out of the arm after it splits in half down the middle) and land an unblockable armor piercing blow on her mutated half, blowing most of it away.
It grows back.
But! I knew that would happen (in and out of character), and that was all I needed. The blow delayed her and pushed her back out of attacking range. I then commence slashing her mutated form apart with my long reaching razor wires as she struggles to get back into attacking range. After an epic battle (wherein she used special evil monster skills like borrowing through the earth and water to try and get at me) She's finally reduced to an impotent torso that can't move, still screaming for us to "return to the earth". Time for the finishing blow!
So, Zona - being Zona - elects to hug her instead, pleading with her not to die and to come back, and trying to tearfully reminisce about good times. The other parties (in-character) clamor that this is hopeless and Hilda will probably regenerate and kill me instead.
Commence madness / mental corruption cure check on Hilda
...
...
...
Pass
With Zona's hug reminding her of who she really is, Hilda passes out as her two ego's rage against eachother. The corrupted one slowly dies as Hilda's memories are able to break through and give her strength to resist the madness.