When this card is revealed by your Green effect, add it to your hand.
[LV1][LV2] (When Deployed) Put one core from the Void to your Reserve.
[LV2] When your "HeroBeast" Spirit is attacking, the opponent can't end the Attack Step through effects. Also, when you control "The Grandwalker Hermes," this Nexus can't be returned to the Hand/Deck by opposing effects.