There is one weapon for each weapon type so choosing

Part 7 (Level 70+): Whenever you are ready (you don't HAVE Battle of the immortals Gold to be above level 70) head over to the Gorge of Silent and hunt Master Stone Golooms.

You need 11 boxes from them which unfortunately don't drop every time. I think I went 4 Golooms once without a drop. They also have a ton of HP... So this may take a while...

Afterwards, return to Kay for a choice of one of 11 weapons, all of which are in their Grand/Saint/etc. form. There is one weapon for each weapon type so choosing shouldn't be a problem. Head back to the Gorge and speak with Med in the small village in the southeast corner.

All the mana chargers you need to find are actually in the village itself. The first one is located around the barrels near the building entitled "Wine Shop". (Med is seriously retarded if he couldn't figure that out himself...)

Now look for the building with a huge purple bubble floating over it and approach the front door to receive your second charger. The area around the building directly north of the bubble building has your next charger so head over there and grabs it.