Hi, writing OO code by hand is a pain the arse and consumes valuable time that should be spent developing your game scenarios :-) Use a Modern Perl OO framework instead. Working "without CPAN" is for masochists.

Here is a small demonstration using Moo based on what I could glean from your OP. I hope it's useful.

use 5.026; use warnings; use Data::Dumper;

{
    package Entity;
    use Moo;
    use Types::Standard qw/ InstanceOf Int /;
    has race      => ( is => 'ro', isa => InstanceOf['Race'],  require
+d => 1 );
    has class     => ( is => 'ro', isa => InstanceOf['Class'], require
+d => 1 );
    has game_rank => ( is => 'rw', isa => Int, default => sub{ 0 } );
    sub increase_rank { $_[0]->game_rank( $_[0]->game_rank + $_[1] ) }
    sub decrease_rank { $_[0]->game_rank( $_[0]->game_rank - $_[1] ) }
    1;
}

{
    package Race;
    use Moo;
    use Types::Standard qw/ Str /;
    has name  => ( is => 'ro', isa => Str, required => 1 );
    has realm => ( is => 'ro', isa => Str, default => sub {'Middle Ear
+th'} );
    1;
}

{
    package Class;
    use Moo;
    use Types::Standard qw/ Str /;
    has name     => ( is => 'ro',   isa => Str, required => 1 );
    has is_noble => ( is => 'lazy', builder => sub { $_[0]->name eq 'h
+igh' } );
    1;
}

{
    package Elf;
    use Moo::Role;
    use Types::Standard qw/ Enum Str /;
    has name => ( is => 'ro', isa => Str,             required => 1 );
    has sex  => ( is => 'ro', isa => Enum[qw/ m f /], required => 1 );
    1;
}

{
    package Ranger;
    use Moo::Role;
    use Types::Standard qw/ Str /;
    has ranger_rank => ( is => 'ro', isa => Str, default => sub { 'Pri
+vate' } );
    1;
}

{
    package RangerElf;
    use Moo;
    use Types::Standard qw/ Str /;
    extends 'Entity';
    with 'Elf', 'Ranger';
    around BUILDARGS => sub {
        my ( $orig, $class, %args ) = @_;
        $args{'class'} = Class->new( name => $args{'class'} );
        $args{'race'}  = Race->new( name => 'Elf', realm => 'Gondor' )
+;
        return $class->$orig( %args );
    };
    has sword_name => ( is => 'rw', isa => Str );
    1;
}

#####################################################

my $ranger = RangerElf->new(
  name        => 'Fingolfin',
  sex         => 'm',
  class       => 'high',
  ranger_rank => 'Captain',
);

say sprintf '%s\'s game ranking is now: %s',
                $ranger->name,
                $ranger->game_rank;

if ( $ranger->race->name eq 'Elf' ) {
    say sprintf 'As an Elf, %s gets a special sword.', $ranger->name;
    $ranger->sword_name('Ringil');
}

if ( $ranger->class->name eq 'high' and $ranger->sword_name ) {
    say sprintf '%s\'s game ranking is now: %s',
                $ranger->name,
                $ranger->increase_rank(10);
}

say sprintf '%s %s a member of the nobility.',
             $ranger->name,
             $ranger->class->is_noble ? 'is' : 'is not';

say '-' x 32;
say 'Obj dump: ' . Dumper $ranger;

__END__
[download]

Outputs:

$ perl 1203175.pl

Fingolfin's game ranking is now: 0
As an Elf, Fingolfin gets a special sword.
Fingolfin's game ranking is now: 10
Fingolfin is a member of the nobility.
--------------------------------
Obj dump: $VAR1 = bless( {
  'class' => bless( {
    'is_noble' => 1,
    'name' => 'high'
  }, 'Class' ),
  'game_rank' => 10,
  'name' => 'Fingolfin',
  'race' => bless( {
    'name' => 'Elf',
    'realm' => 'Gondor'
  }, 'Race' ),
  'ranger_rank' => 'Captain',
  'sex' => 'm',
  'sword_name' => 'Ringil'
}, 'RangerElf' );
[download]