That one fic where the mc turns into a weak monster for a dungeon and when they die it redo's except they gradually lose their memory each time

[GreenKazoo]

Each time they or the boss mob for the dungeon floor dies the mc gets flung back into (purgatory? maybe) a new monster's body to inhabit, they get all the monsters memories and instincts which make it pretty screwy for the mc and is no good for their memory either.
they go goblin, slime, dark fairy(zombie-fairy?), skeleton (with a sword and cape), mimic, and then the corpse of a skeleton mage (that used to be some dude who was a teacher for the former hero)

in it the mc meets the Hero and his party constantly (it feels like an odd timeloopy thing going on because they repeat stuff but the hero's party, with the exception of the thief, don't remember anything)
somewhere along the line the mc gets a shoddy and ancient system from the corpse of a former hero. it had animated images for the ui which was cool

 

[Razmatazz]

Hey, this sounds like my old story, Respawn Condition: Trash Mob

Glad I could stick in your memory!