public static IConditionBuilder IsActiveSkill(this IMetaStatBuilders @this, Skill skill)
        {
            var activeSkillItemSlot    = @this.ActiveSkillItemSlot(skill.Id);
            var activeSkillSocketIndex = @this.ActiveSkillSocketIndex(skill.Id);

            return(activeSkillItemSlot.Value.Eq((double)skill.ItemSlot)
                   .And(activeSkillSocketIndex.Value.Eq(skill.SocketIndex)));
        }