Oh shit, just realized
New addition to the "MC of story-driven game doubles as nuclear bomb" group
LADS with the aether core
Obey Me MC needs the ring, otherwise she blows up like everything
Stelle/Caelus in HSR with the Stellaron (?) (been a while since I played that one)
Possibly TWST cuz Grim is kinda an extension of Yuu and he's sorta a ticking time bomb for overblot
And now, TDBK MC! She's basically a bioweapon with a countdown clock. When her time is up, she goes Kyklos, and might attack a ton of DA students and make THEM Kyklos, and over and over, basically Armageddon