We All Do It Together

Several people all take part in some critical action by taking hold of a weapon or object -- normally used only by a single person -- that is key to the action.

Depending on the implement and the situation, this can be a subtrope of Improbable Use of a Weapon.

Anime and Manga

 * At the climax of the first season of the Sailor Moon anime, the spirits of the Sailor Senshi all join Usagi in casting through the Moon Wand by grasping the wand with her. (Unless you're watching the North American dub, in which case they weren't dead, they were just waiting off-screen for the right moment to return.)

Fan Works

 * In the Harry Potter fanfic The Arithmancer, Harry and Ron join Hermione in driving the basilisk fang through Riddle's diary at the end of their second year.
 * In this vignette from the unfinished Mega Crossover Girls, Girls, Girls, Skuld, Rin-rin and Kaolla Su together throw a massive switch to activate an improved and empowered Robe system for the Otome of Mai-Otome.
 * In chapter 65 of the How to Train Your Dragon/real!history crossover fic A Thing of Dragons, Ruffnut (still recovering from giving birth to twins) and her liegeman Einar kill a berserking would-be assassin by driving a knife into his guts together.
 * At the climactic moment of Remember, a Harry Potter fic by sbmcneil, Harry and Ginny together drive Slytherin's sword through Voldemort's chest.