[A small but sharp obsidian knife, rather than anything close to iron. (Don't say Kaede can never be considerate.) It isn't decorated with any antler, but does have some pretty red wood for its handle. Surely Akko can use it to open boxes or trim plants. It comes with a note warning that it's fragile and the shards hurt like glass, though Kaede's failed to actually sign her name. The note's written in Japanese, though, and there's some red down stuck to the box. It's not hard to sleuth out who gave Akko a knife.]
Modranicht Gift