Seems we need one of these to evolve our weapons to get 5% more attack. Since I didn’t see any of these anywhere, I suppose they drop from the new HG (unknown sanctuary)… so I spent one hour yesterday killing bosses on 2F (nice way to recycle those old ones by the way…), but all I got from that were breath of power, a few enhance aids/enchant jewels and that’s pretty much it unfortunately. So I guess they have a very low drop rate…
From those who roam this HG and got one, what should I expect in term of drop rate? Ten hours farming? One hundred? More?