Titles of Eps 6-9 were just released. Thx go to Reddit for raising the alarm on it.
Ep6 火あぶりの夜宴 --> The evening's banquet of burning at the stake
Ep7 黒き魔女 --> Black witch
Ep8 魔窟の再会 --> Reunion in the den of evil
Ep9 亡者の血流 --> The blood flow of the dead
Here's my assessment based strictly on how titles align with the manga and what we've been shown in previews:
Ep 1: Dragon Slayer — Parts of Vol 1 and 14
Ep 2: Holy Iron Chain Knights — Vol 16 (eps 119-121)
Ep 3: Night of Miracles — Vol 17 (eps 122-125)
Ep 4: Revelation — Vol 17 (eps 126-130)
Ep 5: Tower of Conviction — Vol 17 (eps 131-136)
Ep 6: Banquet of Stake Burning — Vol 18 (eps 137-143)
Ep 7: Black Witch — Vol 18 (eps 145-147)
Ep 8: Reunion in the Den of Evil — Vol 19 (eps 147-150)
Ep 9: Blood Flow of the Dead — Vol 19 (eps 151-154)
Ep 9's title aligns with a 2-part episode that closes out Volume 19. Which gives them presumably another 16 episodes to cover the remaining 2 volumes of Conviction, if that 24 total eps thing is to be believed. That's more than enough, given the pace they've set. So, we really still have no idea where this will end. Could be Hill of Swords. I just don't know. Can't be much further than Vol 22 given how the scope takes off dramatically during Millennium Falcon. Wouldn't make much sense, production wise, to group that within the same season.