As I said, chain. I remember I killed the first dragon (not the one Sydney summons, the one before you leave the first dungeon) with a single chain. I don't think you'll be able to deal more than 10 Hp per hit on boss fights, mainly because the game relies on chain attacks for damage.

Quote Originally Posted by Lord Chainsaw
That door probably led to the Iron Maiden, the game's bonus dungeon. I don't think it accounts for 30% map coverage in the game, but it is quite a chunk.
I think I did that. The door I forgot was on a dungeon that you have a time limit for getting through it. I remember the path split and it lead to a door locked with the silver key.

Also, there was a corridor with loads of locked doors with symbols on the ground. What was that? Secret bosses or something?