Chamomila

"I-it can still dice you to pieces, and set those same pieces ablaze—!! Watch your tongue!!!"

An eccentric researcher and wielder of the Demon Lord's Blade, an extremely powerful famous weapon, recognizable even in its sheath - however, it's broken and unusable. Chamomila often uses it to scare off others from fighting her, as seeing her even touch it sends shivers down their spine. She thinks it's the funniest thing ever to see people's faces when they realize the blade is shattered after being taunted - but becomes incredibly insulted and defensive when they make fun of it, as a sword this formidable must be very hard to break.

Chamomila wanted to find a bladesmith skilled enough to reforge her sword. As it is made up of a special ore, found and forged right in the lava caverns where the Demon Lord used to reside, your average blacksmith's anvil won't really make any sense of it, as even though she still has a pouch of the blade's fragments, the temperature to melt such a thing would be too great for a simple furnace.

She then tried to find an enchanter to give her sword a magic blade - but the Demon Lord's weapon is constructed in such a manner that any form of magic enchantment is consumed, like a black hole, but for wizard's mana. It is simply too old of a weapon to sustain modern magic - old arcana lost to time is the only way to enchant such an ancient relic.

But perhaps there was a reason this sword is near impossible to reconstruct - its use, long ago, was as a ritual blade, one that slashed the sky and opened a rift to the abyss.

A battle lasting many, many years took place to fight against the invaders from the abyss, until the Demon Lord was slain, and this calamity put to rest... by his very blade. And there it rested, for centuries - until it was rediscovered by Chamomila, an explorer who has proficiency in both swordfighting and ancient history.

A find as great as this was a once-in-a-lifetime event - she took great caution pulling the Demon Lord's Blade from his own skull to then realize it's the real deal, and attempted to slash it in two out of excitement (as surely, a sword of this power would cut through a skull like butter...)

...yet the blade shattered like glass, her heart practically making the same noise. After having sat dormant for thousands of years, its strength dwindled, enough that its previously unbreakable blade is, unfortunately, quite breakable.

Surely, no consequences would follow from disturbing its thousand-year rest in the center of the earth... but I'm not sure it'd be too thrilled to talk about it either. After getting a life's worth of research on this sword ruined in one swing, hearing it COMPLAIN would be a second punch to the gut! A talking sword... Chamomila hadn't considered that the Demon Lord's consciousness could be trapped inside this sword, yet it is, in a compact, pathetic, and weak form.

Being able to taunt the god that ruled over the entire world like it's a little baby is an extremely satisfying (and dangerous, of course, but what's it gonna do, stab Chamomila? it's a sword without a blade!) pastime. And of course, only the wielder of the blade can hear his voice, so other people think she's lost her mind arguing with herself...

This strange wielder's perk extends to the followers of the Demon Lord too - any monster that approaches Chamomila does so not to harm her, but to bow - they believe that she is their Lord's reincarnated form, and reasoning with bloodthirsty monsters that no, she is in fact not their leader is... not exactly something you'd want to do while being surrounded by so many of them.

Having a traveling companion that can simply dismiss monster attacks with a wave of a hand is a terrifying but great skill, but also, showing your adventuring party the dog tricks you taught vicious bloodthirsty beasts is a little abuse of power. At least it's entertaining, and a relief that a sword of this magnitude got into her hands out of anyone's.