Summary of the epic battle, for those who weren't in the channel and are curious.
Start of battle: A bunch of stuff gets broken due to Ithy's ability (the shotgun, a .45, the dynamite, the .38, the flamethrower, both Shrivellings and Wither, namely), stuff gets traded around. Daisy, Leo, Joe, and Tony are blessed. Ithaqua needs 66 successes to kill.
Round 1: Energy Surge. Ithaqua attacks first, but all spells cost zero sanity to cast.
Ithaqua: Kate - 1/5 stamina, discards Sir William Brinton to go to 4/4.
Investigators: Daisy - 2/5 (spending 3 clues), Kate - 2/6 (spending 5 clues), Leo - 5/8, Joe - 17/26 (spending 6 clues), Wilson - gj, Tony - 4/7 (spending 2 clues), 31/66 successes.
Round 2: Dangerous Plan. Any investigator that does not roll a success on their combat check is devoured. Leo loses his blessing.
Investigators: Daisy - gj, Kate - 1/1, Leo - 1/7 (spending 3 clues), Joe - 8/12, Wilson - gj , Tony - 4/5, 45/66 successes.
Ithaqua: gj.
Round 3: Catching Their Breath. Ithaqua attacks first, but investigators heal 2 sanity/stamina, split how they like.
Ithaqua: gj.
Investigators: Kate - gj, Leo - 1/7 (spending 3 clues), Joe (6/6 stamina) - 5/12, Tony (5/7 stamina) - 2/5, 53/66 successes.
Round 4: Flying Debris. Investigators that attack lose 2 stamina.
Investigators: Joe (4/6 stamina) - 11/12, Tony (3/7 stamina) - 3/5, Kate and Leo twiddle their thumbs because Ithaqua is dead.
So, yeah, Joe Diamond is hax.