I'm a lvl 94 I/L with 4m, so I decided to mushmom at zmushmom for a while. In bout 30 minutes I got 4 scrolls, considering that almost every channel there is empty on Broa. Funny thing is half the time When I drop in and kill the little mobs at the bottom, it spawns.

I got:

60% 2 handed axe
60% staff
60% 2 handed sword
60% 2 handed bw

:/