I was wrong in saying that the RNG was faster with 0, this is not assembler shifted in perl. The system was made on FreeBSD 11.0 and Debian GNU/Linux. Now I've tried to make some main characters by rewriting the Deity class :

package HollyGameAI::MutualExclusiveDeityAI;

our @ISA = "MutualExclusiveAI";

sub MutualExclusiveDeityAI {
        my $class = shift;

        my $self = $class->SUPER::MutualExclusiveAI(@_);

        bless $self, ref($class) || $class;
}
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Here are some examples for use as Deities for the main character _NOTE_ however that I do not know how to override the Factory with inherited methods inside the MutualExclusiveAI class, I cannot repost however with that as a question (the clue of the post however) :

package HollyGameAI::MutualExclusiveAI;

use lib "../HollyGameAI";
use Factory;

sub MutualExclusiveAI {
        my ($class) = shift;

        my $self = { aiclass => HollyGameAI::Factory->Factory(@_) };

        bless $self, ref($class) || $class;
}
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Here are Moradin and Umberlee classes based on the system :

package HollyGameAI::Umberlee;

our @ISA = "MutualExclusiveDeityAI";

sub Umberlee {
        my $class = shift;

        my $self = $class->SUPER::MutualExclusiveDeityAI(qw(swim empow
+er));

        bless $self, ref($class) || $class;
}
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package HollyGameAI::Moradin;

our @ISA = "MutualExclusiveDeityAI";

sub Moradin {
        my $class = shift;

        my $self = $class->SUPER::MutualExclusiveDeityAI(qw(empower));

        bless $self, ref($class) || $class;
}
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Here is a better RNG, the meaning of the superfluous sets is to use the roll previous method without shifting in :

package HollyGameAI::RNG;

### Random Number God, dice class

sub RNG {
        my $class = shift;

        my $self = { dx => 0 };

        return bless $self, ref($class) || $class;
}

sub set {
        my ($self, $dxx) = @_;
        $self->{dx} = $dxx;
}      

sub rollDX {
        my $self = shift;
        return rand($self->{dx});
}

sub rollD1 {
        my $self = shift;
        return rand(1);
}

sub rollD3 {
        my $self = shift;
        return rand(3);
}

sub rollD6 {
        my $self = shift;
        return rand(6);
}

sub rollD10 {
        my $self = shift;
        return rand(10);
}

sub rollD20 {
        my $self = shift;
        return rand(20);
}

sub rollPreviousDX {
        my $self = shift;
        return rand($self->{dx});
}

sub roll {
        my ($self, $dxx) = @_;

        $self->set($dxx);

        given ($self->{dx}) {
                when ($_ = 0) {
                        return 0;
                }
                when ($_ == 1) {
                        return rollD1;
                }
                when ($_ == 3) {
                        return rollD3;
                }
                when ($_ == 6) {
                        return rollD6;
                }
                when ($_ == 10) {
                        return rollD10;
                }
                when ($_ == 20) {
                        return rollD20;
                }
        }

        return 0;
}
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