what lvl of ghosts did you hit?

as far as I can understand during my own test we have the same that as invaders.

it would be more clear if you'll add screens of your hits

Right now I had no any ideas because I didn't meat any troubles with this

You just was unlucky, items drop system very random

I can confirm that the attack runes are the rarest drop. It took me 1.3m energy to get 12 rare runes with shaman lvl 60 and the rsrch unlocked for lvl 6 ghosts. However I noticed that when I bumped rsrch in shaman bottom tree to lvl 6 like crit, ofense and sustained attack so one lvl above the requirement I started getting 132k drops of runes.

 In the process of getting blue melee attack runes I got up to epic and legendary on the rest but I didn't fuse those to legendary  cos it doesn't pay off so I took epic construction, yield and silver production ones.