http://ffrk.kongbakpao.com/orb-dungeon/
Mid October best guess
tl:dr, 4* orbs, summon orbs, and 4* summon orbs in abundance. 5* semi-farmable, enough that it's worth dropping Mythril for stamina refreshes.
I've got 200 Mythril with Orb Dungeon written on them. Gonna walk out of there with 2 r5 Valefors, and seeing how far I can go with Meteor/Full Break.
Mid October best guess
tl:dr, 4* orbs, summon orbs, and 4* summon orbs in abundance. 5* semi-farmable, enough that it's worth dropping Mythril for stamina refreshes.
I've got 200 Mythril with Orb Dungeon written on them. Gonna walk out of there with 2 r5 Valefors, and seeing how far I can go with Meteor/Full Break.