I actually beat Hall of Guardian with the Faction team at Level 500 today after putting off the 3rd battle for multiple weeks…
Glad that its over. Hardest part is not getting the short end of the stick from the AI gem spawn algorithm at the top of the board.
Last 5 minutes of the battle. Lots of “luck”
I should have mentioned my team was Silent Sentinel, Ethereal Sentry, Arcane Golem, Gargoyle with the Bear Banner and not the faction banner.