When this card was either revealed by the effect of your "Godseeker Librarian Doll †Lena†" or sent to the Trash by the effect of your "The Grandwalker Hera," you can add it to your hand. When you've done so, put one core from the Void to a Grandwalker Nexus you control.
Flash - Destroy two opposing exhausted Spirits/Ultimates. Also, by sending one core from your "The Grandwalker Hera" to the Void, during this Turn, opposing effects can't end the Attack Step.