sub light {
        my $self = shift;
        return $self->new(
            type   => 'light',
            damage => '1',
            speed  => '5',
        );
    }

    sub fast {
        my $self = shift;
        return $self->new(
            type   => 'light',
            damage => '1',
            speed  => '7',
        );
    }

    sub heavy {
        my $self = shift;
        return $self->new(
            type   => 'heavy',
            damage => '2',
            speed  => '4',
        );
    }