This might be related to the proof Grodek had on him the night of his murder.
Spoiler for Age manga sidestory:
Speculation from 4chan:
>Where the hell did Veigan get their super technology?
Someone has been stealing information from EXA-DB, and the Veigan may have been using the information to build their army.
EXA-DB, a database stored with all weapon technology information available before the Silver Chalice Treaty, hidden inside an astroid by the EF.
