public static AuraEffectHandler CreateEffectHandler(
SpellEffect spellEffect, CasterInfo caster, Unit target,
int effectValue, ref SpellFailedReason failedReason)
{
var handler = spellEffect.AuraEffectHandlerCreator();
handler.m_spellEffect = spellEffect;
handler.BaseEffectValue = effectValue;
handler.CheckInitialize(caster, target, ref failedReason);
return handler;
}