## Hell's Wrath; Deals 0.5% of NPC's MaxHP for every 10 points of client (casters) maximum INT
## /quests/global/spells/600.pl   <-- or whatever spell ID it will be of course

sub EVENT_SPELL_EFFECT_NPC
{
    $responsibleclient = $entity_list->GetClientByID($caster_id);
    if ($responsibleclient)
    {
        my $manacost = ($responsibleclient->GetMaxMana() * 0.03);
        if ($manacost <= $responsibleclient->GetMana()) {
            $responsibleclient->SetMana($responsibleclient->GetMana() - $manacost);
            my $basefiredamage = int($responsibleclient->GetMaxMana() * 0.1));  # 10% of clients max mana
            my $damagebonus = int (($responsibleclient->GetMaxINT() / 10) * ($responsibleclient->GetMaxMana() * 0.005));
            my $totalfiredamage = $basefiredamage + $damagebonus;
            $entity_list->MessageClose($responsibleclient, 0, 30, 0, "".$responsibleclient->GetCleanName()." conjurs the wrath of hell to scorch ".$npc->GetCleanName()." for $totalfiredamage damage!");
            $npc->Damage($responsibleclient, $totalfiredamage, 600, 24, 0);  # in your spells_new make the mana cost zero as we'll handle that in script below
        } else {
            $client->Message(15, "You have insufficient mana to cast that spell!");
        }
    }
}