I was surprised when I found out that ace dungeons can drop improved dark shard feedstocks now. There wasn't any patchnotes about it.
It's really nice because doing Lilith literally takes 2 seconds and you can do it 3 times per day. It has a pretty high chance to drop feedstocks (about 66% I'd say). Same with other ace dungeons.
I'm doing Lilith and the arena every day now and maybe some other ace dungeons when normal dungeon queues won't pop up.
It's an easy way to farm gold or feedstocks if you need them to enchant your weapons.
EDIT: There is a double loop event going on so your chance of getting good loot is doubles even in ace dungeons, ghillie, etc!
