Level 500 delve with faction team is hard… And that’s an understatement.
Some are possible, with a bunch of luck, such as crypt. Rift is doable with the entangle feature.
Hall of guardians? Near impossible.
How to make it less impossible:
- make weapon faction part of the troop.
- make potions available for faction team only (special bonus).
- use other faction teams on any delve.
- have faction team gain a bonus when clearing a room (and not just for enemy).
Now I don’t want that particular achievement to be a walk in the park. Just make it less extreme.