void FilterTargets(std::list<WorldObject*>& targets)
    {
        if (!GetCaster())
            return;

        if (targets.empty())
            return;

        std::list<GameObject*> goList;

        GetCaster()->GetGameObjectListWithEntryInGrid(goList, GO_CRYSTAL_WALL_COLLISION, 100.0f);

        if (!goList.empty())
            for (std::list<GameObject*>::const_iterator itr = goList.begin(); itr != goList.end(); ++itr)
                targets.remove_if(WallCheck(GetCaster(), (*itr)));
    }

    void Register() override
    {
        OnObjectAreaTargetSelect += SpellObjectAreaTargetSelectFn(spell_dargrul_magma_wave_filter::FilterTargets, EFFECT_0, TARGET_UNIT_SRC_AREA_ENEMY);
    }

    private:
        class WallCheck
        {
            public:
                WallCheck(Unit* searcher, GameObject* go) : _searcher(searcher), _go(go) {}

                bool operator()(WorldObject* unit)
                {
                    return (_go->IsInBetween(_searcher, unit, 4.0f));
                }

            private:
                Unit* _searcher;
                GameObject* _go;
        };