they tell you where to get it in the cutscene.
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I also am stuck on that. Yeah, its in the stores... But i cant access/battle anything on the right river bank. All zones are greyed out.
I guessed talking to Claire would open another attack possibility, but i cant do that because the only time i see her is sitting in front of Emmas room where no talk option is given, while going to her room ends in an error...
Btw, i love this game, such a large cast of endearing and unique characters, humour, intrigue and an awesome minigame for the battles. Cant wait for more content...