When you summon this Spirit card, you can send 1 core from your life to trash. When you've done so, the cost of this Spirit is -3. You cannot activate your Burst by this effect.
[LV1][LV2][LV3] (When Attacks) Destroy 1 opposing Spirit with 5000BP or lower.
[LV2][LV3] (Your Attack Step) When you Advent a Spirit card from the family: ""Astral Dragon"", send 1 core from your opponent's life to their reserve.