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Hey, this would be a great question to ask in the (un)official Lancer discord: https://discord.gg/lancer

The folks over there are great, and there are a ton of resources they've got listed for supplements to play.

You put it into COMP//CON, or Foundry, for mech and pilot info. It's how you build pilots/mechs/NPC's out with the books you own.

Gotta have Mary following you for it to work.

Final version has some prologue(?) content, according to 1.9.1's update post.

Your INT's gotta be 5, or higher. Keep grinding with the book.

It's Roselyn's halloween costume CG. Change her outfit, and you should get a special scene.