Farming talismans is pretty easy here, I have a solid setup in my Lv80 Assassin Emiya and a friend's grailed Assassin Emiya with MLB talisman CE. The wyverns and the dragon at the end mean nothing since it's practically raining crits, and Nightingale goes down quickly enough. With a full loadout of talisman CEs it's rather painless grinding.
Currency on the other hand is giving me some real major trouble. That Assassin Emiya is still my best servant, and the daemons just tear him to shreds, so I have to keep him in the back line until the end. Astolfo deals with them reasonably enough, but because I've still been unable to get any Octuplet Crystals, I am not able to take Astolfo any higher than Lv60, so it is a very slow process. The daemons usually have my entire frontline worn down to ~40% before they are gone. I try to keep them alive with Hans, but maybe I should try to bring out Irisviel again for that.
I have not lost to Arjuna and Karna yet, but I had to use a command spell on my first attempt. My best shot is to either take support Drake/Santa Alter to help beat down the Daemons, or support Karna/Lancer Alter to NP both of them and finish off Arjuna quickly since he NPs faster than Karna does.
Either way every currency run feels like a real struggle right now. If only I could ascend Astolfo then at least the first two waves would be easier.
Edit: Another surprise great heroes CE. That makes 7 in total now? (including the shop ones) If I get one more I'm just going to MLB it.