Arm yourself with the word T-Shirt

That’s a trick weapon in Bloodborne. The sword is one part and it transforms into a hammer by placing the sword into a giant stone hammer sheathe. There is also Santier’s Spear in DSII, if you played it you might remember it’s the spear with it’s point stuck in a rock, so you can mash people with it as part of the moveset. The rock has a truly obscene level of durability, though, Arm yourself with the word T-Shirt so you can swing that weapon virtually forever before it breaks. If you play your cards right, you get infinite durability, iirc? Plus it gets a new moveset of some of the best attack animations from a bunch of other weapon types.

Arm yourself with the word T-Shirt, ladies tee, tank top, v neck

The DM could watch for opportune moments near tier thresholds to have parts of the stone break away unleashing more of the swords true power. So at levels 1-4 you’re carrying what is basically a club with an ornate grip, then somewhere around level 4-5 take advantage of a critical hit to upgrade it into a maul that grants the wielder lesser smite as some of the swords magical essence peaks through the cracked surface. Eventually you have a guy wielding Excalibur who simply brute forced the stone off of the sword, Arm yourself with the word T-Shirt and the villagers tell stories of how he forged his sword on the battle field.  Very occasionally, for comic effect, I’d have him absentmindly pull it out to cut a piece of cheese, or similar, then put it back without thinking about it.