I can't get a drop either, seems to be super rare.
Beat today's challenge, took me three tries but I didn't use any command seal, my only damage dealer was an NP5 Emiya support, I had Mash David and Tristan keep him as long as possible.
I've yet to do yesterdays challenge, but with no healers/buff removal (Tristan is lvl 40 and is gonna stay at that level for a while, he also wants medals) I'll just die to doom.
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