Give any type of alternate currency to the NPC and she will hand you back one or more Promissory Notes at the exchange rate stated below
Lore & Dialog
Higashiyama Akako tells you, "I am interested in exchanging alternate currencies for Promissory Notes which may be used at the vendor over there to buy other alternate currencies."
Higashiyama Akako tells you, "Here are my current rates:"
Higashiyama Akako tells you, "Colosseum Coin = 5 Promissory Notes"
Higashiyama Akako tells you, "Small Olthoi Venom Sac = 2 Promissory Notes"
Higashiyama Akako tells you, "Ornate Gear Marker = 2 Promissory Notes"
Higashiyama Akako tells you, "Ancient Mhoire Coin = 1 Promissory Note"
Higashiyama Akako tells you, "I will accept either 1 or 10 currencies per exchange."
You allow Higashiyama Akako to examine your Colosseum Coin.
You hand over 1 of your Colosseum Coins.
Higashiyama Akako gives you 5 Promissory Notes.
Higashiyama Akako tells you, "I appreciate the business."