My Verse/setting has 2 stories in it, one is on the fantasy-magic side and the other is on the scifi-tech side. On the "magic" side of things :
Apocalypse-> A blackened green crystal spear that causes razor wind which can cut planets in half and send compressed piercing projectiles that can go through similarly massive objects.
Aikyo's scythe, which absorbs negative and painful feelings and converts it into energy for her.
Seiryu's swords, which he makes by freezing moisture in the air and discards when he doesn't need it. Since he makes them when he needs a weapon, they can vary from just a big sharpened block of ice to being nigh indestructible and absorbing energy so that everything it touches goes to absolute zero.
Fenrir-> A double bladed war axe that wounds you depending on the will of it's wielder, it can deal blunt hits or tear the target apart on contact and everything in between.
-> A sword with a blade that grows hotter the more energy it's wielder emanates. When it damages something it starts a chain reaction of heat transfer that burns and/or melts everything around the cut.
Shinigami's arm blades, one that cannot kill no matter what wounds it causes you and the other one any wound of which is fatal ( with a few exceptions ).
Nihil-> A dark coloured katana that gets sharper the stronger it's wielder is and is only damaged by sharing the wielder's damage. It gets dents if the wielder is wounded, repairs if the wielder heals, breaks if the wielder dies and repairs from that if the wielder is resurrected or if it gets a new wielder.
Sozo and Mu-> Izanami's katanas, Sozo has infinite mass and the range of it's cuts and stabs can extend beyond it's physical range to infinity and is not affected by distortions in reality. It can stab through black holes and cut verses in half if she so wishes. Mu is made of nothing and everything it goes through ceases to exist. Adverse side-effects these traits should cause are prevented by their wielder.
And on the tech side it's mostly weapons that we have but modified for superhuman fighters, like belt-fed grenade launchers, fully automatic anti-material rifles, machine guns that fire oversized "shotgun" shells, semi-automatic RP Gs
, man-portable 120mm cannons, 15mm handguns, .50 cal SM Gs
, 300mm APEI rail guns, etc. Then there's super alloy monofilament electrified and heated blade melee weapons for the newest generation super soldiers that "normal" weapons are next useless against because they're too tough, too hard to kill or just to fast to hit in the 1st place Or all of the above. There's also new-gen guns that all work like rail guns. Beyond those there's fancier high-tech heavy arms brought from the very very far future/made by The Harvester like cannons that have internal anti-matter engines that shoot projectiles at large fractions of the speed of light, warp bombs that bend space on large scales in harmful ways and Big Crunch-Bang projectors that shoots a small ball of *something* that expends to encompass whatever you want to destroy and then compresses everything inside that large sphere into a singularity, then that singularity can be guided wherever you want ( like into the core of the planet you just crunched a chunk off of ) and the singularity decompresses into a mini big bang. The Harvester herself could also count as a weapon since she's a person of mass destruction/humanoid abomination and can do simple but very harmful things like turning off the star of the system her target's planet is in. Yay for overkill.