Epic Shadowlord/Vrock Packages

Warm winds and Hello!

Does anyone know where/how to adjust the packages for the skills/feats/attributes/etc. for the Epic Vrock and Epic Shadowlord Summons? I understand that the mechanism itself is scripted to level the creature up, but I’m trying to figure out where it’s receiving its marching orders, and I don’t believe it’s in a script. If I didn’t know any better I’d say it was using the default Fighter package (those awful pre-packaged cookie cutter templates).