Originally Posted by
Gamefaqs, Dawn of Souls board
Once you obtain the Ultima Tome, a strange force wreaks havoc all over the world. The Cyclone itself is right outside of Fynn. Before you go inside, NOW is the only time you can get the Blood Sword.
1. Inside Castle Fynn, make sure you go talk to Hilda before getting the Wyvern. Trust me on this. If you get the Wyvern first, you eliminate the one way to get the Blood Sword.
2. Talk to Hilda and she'll let you Learn the Key Term Cyclone. Gordon teaches you as well, but I just like Hilda better.
3. With the Key Term in your list, leave the Castle and go into Fynn (the town). Paul's house is on the southwestern corner of the map. Go inside and Ask him about the Cyclone. He'll call you crazy, but he'll let you access his personal stash.
4. In the southwestern corner by Paul's bed, go search the eastern wall. Try walking into it and you'll eventually be able to walk through the wall.
5. Inside the wall, you'll be able to find the Blood Sword inside one of the eight chests.