As the title of this post suggests, I cleared the first chapter of the DLC side story and was able to go to Abyss in the main story timeline, and there was a list displaying exclusive and special weapons (such as Rapier, Levin Sword, etc.) in a place named the Altar shop I believe? Anyways, this might be a dumb question and all, but are you able to use these exclusive special weapons in early game or late game of the main storyline or are those weapons reserved for the side story only? Also, if by chance I am not able to get access to it instantly in the side story DLC, would I need to recruit Constance or Hapi (I forgot which characters you get from which chapter) in order to unlock the Abyss weapon and item shop? Please and Thank you.