While this card is in the Extra Monster Zone, neither player can Special Summon monsters from the Extra Deck to Main Monster Zones, except to a zone this card points to. While this card points to a monster, it cannot be destroyed by battle or card effects, also neither player can target it with card effects. Once per turn, when a monster(s) on the field is destroyed by battle or card effect: You can Special Summon Level 4 or lower "lswarm" monsters from your Deck in Defense Position, up the number of monsters destroyed.