In "Dragonquest VIII," where do I get the key that unlocks the rooms that are full of treasure chests?

Question

There are several rooms that you can't access because they're locked with a door made of iron bars. Where on earth do I get the key that unlocks them?

Answer 1

if its the blue key u get from lady outside orkutsk or wutever that place is the one who had nook herbs or something the other key im thinking is in trodain castle somewhere