This linked card cannot be destroyed by battle. You can only use each of the following effects of "NT8000 - SIRIUS" once per turn. During the turn a Link Monster's effect was activated (Quick Effect): You can target 1 face-up card you control and 1 face-up card your opponent controls; destroy both. If this card is sent to the GY, except from the field, and you control a DARK Link Monster: You can Special Summon this card, but banish it when it leaves the field.