While you have four cores on your Grandwalker Nexus(es), this Set burst is unaffected by opposing effects.
☼[ Burst: After Your Life Decreases]
☼[ Burst: After Your Opponent activates a Spirit's (When Summoned/Advents) effect ]
Destroy an opposing 15000 BP or less Spirit/Ultimate. After that effect resolves, summon this card without paying the cost.
[LV2][LV3][LV4] (When Attacks) By sending two cores from your Grandwalker Nexus(es) to the Void, refresh this Spirit.