Alternatively, scrolls of Globe of Invulnerability goes brrr....
House of Grief is especially annoying due to the 4x reflect damage from Radiant Retort (Personally kinda see reflect damage to be a little uninspired for increased difficulty).
First successful attempt used the Globe but decided to retry it after I remembered I had Destructive Wave, which made it alot easier.
For Raphael, funnily enough, I found Harleep and his knockback mephits far more harder/annoying but that'd be because I was locked to the window entrance.
Also, something I'm confused on, how is Raphel's fight supposed to work? I always destroyed the towers, but that apparently makes the fight harder by supercharging him instantly? And his Cambions have radiant reflect damage too?
Also, how was Ansur? I wasn't able to defeat him without the Globe. The AOE reaction damage was a bit much, that and his countdown is 1 turn rather than 2.