Restart from Bloodline 1, then intentionally lose to the Dark Knight during the tutorial. After that, select "Save" and "Restart Castle". Bloodline -1 will begin. Note - You can now also purchase Dark Mech gear.
Mastering weapons earns you stat points you can use to level up. Cheap weapons can be mastered much quicker than expensive ones, so though the expensive weapons may be tempting, you should buy cheap stuff early on and master it first to take advantage of the stat points. After that, you can use better, more expensive weapons to level up near the end of the game instead of crappy, cheap weapons.
Losing to Mech Zero and God King will take you to the new bloodline instead of giving you three options like usual. However, get a second chance by pressing the menu button (used to change equipment and buy items) and go to the option menu. Select the character slot and use another character data (pick one and press start to play with it). After you start playing with the other data, go back to the previous slot where you've lost and you'll find your knight before he was defeated, giving you another shot.
After unlocking the Infinity Blade, you can go to the bottom of the castle and unlock 3 doors. Each door holds a high level monster. Defeating them will unlock a bigger door. There is a robot who is level 300; defeat him and the first guy you play with comes out. Fight him to complete the game. Two buttons appear, one says New Game +, the other says Next Bloodline. New Game + restarts you at Bloodline 1 and takes away all items, you only keep your player level and stat things. But the best part is you get new items in the store. They are very expensive but their stats are worth it.
Here's what I did:
-Leave Euloseum for last.
-Train up your level to about 47 to 50.
-Infinity Blade, Shadow helmet or less, Helio Armour, Equip the Dragoon Shield and Ring you can get from the two other Deathless you defeat.
- Make sure you start the ba