As answered, you can, but...............
My 1st came after 165 drops, when I got a drop.
Check this out though, in one week, I scored 2 mempos off a shadow lord using an archer.............go figure huh?
So, I'd find these shadow lords,.....usually at even hours,(6,8,10,12,2......and so on.....example, between 8:30-9 am
by lady of the snow in winter spur
By Mt Sho, somewhere around the lava pool
by the waste, generally south of the shack where the beetle sits.......
just go into war mode/cast a field spell, and you'll be hitting the thing.