All Seeing Eye should be possible. I’d do it now except I’m saving my shards for chest pulls in the next faction. Definitely need to up the Treasure Hoard.
(I say this as I was able to make it to the boss room Delve 500 at Hoard Level 100 with a full faction team… a few resummoned. I got squashed at the boss fight as expected. CK was a lot harder at Hoard Level 100 for the earlier rooms. Its going to be a bit of guess work how much treasure is needed to survive the boss room as the O.Leech’s scaling isn’t great relative to Lady Morana flat out instakilling something. Max power! )
Hall of Guardians: TimeKnight managed to do Faction 300 with Hoard level 100 which is higher than I would have cared to try for. So Hall of Guardians might be possible? Its outside my area of expertise though, I have no clue how much treasure you’d actually need to survive that.