Manipulating model data

I want to manipulate data in my model how would I do that? I'm trying this but it doesn't work:

class Character extends Model
{
    //Get players by level
    public function scopeGetPlayersByLevel($query){
       $output = $query->orderBy('level', 'desc')->get();
       $output->classid = 100;
       return $output;
    }

    //Get online status
    public function account(){
        $account = $this->belongsTo(Account::class, 'account_name', 'username');
        $account->online = $account->online == 1 ? 'Online' : 'Offline';
        return $account;
    }
}

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