Dreadrock Fortress

[LV I] [LV II] During Your Attack Step

When you reduce your opponent's life with an attack from one of your spirits, your opponent selects one of their exhausted spirits. Remove two cores from it and place them into your opponent's reserve.

[LV II] During Opponent's Attack Step — Flash

You may destroy this nexus to select one of your opponent's spirits. Remove a core from it and place it into their reserve.