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iirc i think you have t go to the scietist's tower in New Ark, for cassie it's kind of complicated and involves a lot of other characters but hte end result is really worth it. there's a wiki that helped me figure it out you can just look for in on google. hope this helped!

for cassie my best suggestion is to go and buy a apartment and sleep in it then talk to your neighbour, keep her close she is way more important than you realize.