Laravel muchos a muchas relaciones con la mesa de pivote
$user = User::find(1); //any user we want to find
$user->trophies()->attach($idOfTrophy);
//pass id or array of a Trophy ids
//suppose admin has selected the trophy from a form and trophy id
// is in $request object, then.
$trophyId = $request->trophy_id;
$user->trophies()->attach($trophyId); //record is created in DB.
attach and syncWithoutDetaching both does same job
Zeevx