The level 8 weapon orbs

Axe
To get level 7 you need to defeat random fiend heads to get the orb. People say that's how you get the 8th level as well, but i've never gotten it.

Whip
Defead random Terminaters in the Mana Fortress. They are hard to kill as they cast lucient barrier.

Javelin
Defeat random Wimpers in the mana fortress.

Defeat random Tsunamis in the Mana fortress. They split into 3, so it's real easy to kill a whole bunch of them.

Boomerang
Defeat random Master Ninjas in the Mana Fortress. These guys are tough to kill, so take caution

Bow
Defeat random Metal Crabs in the Mana fortress. The easiest way is to enter, kill the two at teh entrance, exit, and re-enter. Do this till you get the orb.

Glove
Defeat random wolf lords. They can also be tough to kill, as they hit for buttloads of damage.