Superman Vol.2 #223
In prison, Lucia kills her cellmate, and is then introduced to Talia al Ghul, who offers her a mysterious black rock. Meanwhile, Supergirl visits Superman at the new Fortress of Solitude to tell him that she plans to join Donna Troy in space for the upcoming Crisis. They are interrupted by Blackrock's attack on Lima, which eventually makes its way to the Fortress. Superman fears that Kara will kill Blackrock, but when she relents he consents to her decision to leave Earth.
Estimated Condition: VF/NM