We All Do It Together

Several people all take part in some critical action by taking hold of or operating a weapon or object -- normally used only by a single person -- that is key to the action. This can be symbolic -- an "All for one and one for all!" moment -- or practical (combining physical or mystic strength either to boost results, or when no one person among them is currently strong enough to use the item by themselves).

Depending on the implement and the situation, this can be a subtrope of Improbable Use of a Weapon. When it's not a weapon or a magical artifact, it's frequently a Big Electric Switch or Big Red Button. One possible result is a Combined Energy Attack.

Sometimes leads into, or follows, a Whoa, Bundy! moment.

Please note: This is not "several people do something that it always takes several people to do". Nor is it a generic "multiple people join together to accomplish something that one person can't do by themselves". "Examples" which boil down to one of these two situations will be deleted with prejudice.

WARNING! There are unmarked Spoilers ahead. Beware.

Examples of We All Do It Together include:

Anime and Manga

As seen in the page image, 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.)
In the climax of Princess Tutu, Rue and Mytho/Prince Siegfried wield his sword together to slay the Raven.

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 run Voldemort through with Salazar Slytherin's sword.
In chapter 14 of Tick, Tock, One Little Clock... by "Doctorsgirl", a Doctor Who/Buffy the Vampire Slayer Crossover Fic, the Doctor and the Slayer together press the button which frees the Ood from their enslavement.

Film

At the end of Krull, Colwyn and Lyssa jointly use the flame from their wedding ritual as a weapon to defeat the Beast, firing and directing it together.
At the climax of the 2011 TV Movie Christmas Lodge, Jack, Mary and Mike all take hold of the master switch of the titular lodge's fusebox and throw it together to not only finally provide electricity to the restored lodge but turn on all its Christmas decorations.
Similarly, near the end of the 2020 TV Movie Christmas in the Rockies, Gordon invites Marie to join him in throwing the Big Electric Switch that turns on the town's Christmas tree.

Live-Action TV

Doctor Who, "Arachnids in the UK", the fourth adventure of the 13th Doctor, ends with the Doctor, Graham, Yaz and Ryan all grasping the lever that activates the TARDIS and pulling it as one to symbolize their active decision to travel together.

Video Games

Legend Mode's "Watchers of the Triforce" level from Hyrule Warriors Legends and Hyrule Warriors: Definite Edition has Link, Tetra, Lana, and King Daphnes combining their magical power with Cia to prevent Phantom Ganon from regaining his health.

Western Animation

In episode 13 of the first season of She-Ra and the Princesses of Power, all of the princesses use She-Ra's Sword of Protection to launch a decisive combined attack against the Horde.