Gortash vs 4 Wizards level 12, BG3 Honour mode, no consumable/tadpole

I heard he got major buff on honour mode, and was legit apprehensive. Luckily I managed to Hold Person him before he could transform with the aid of Portent die.
Durge Fiat: Swords Bard 6 / Necromancer 6
Tav Paul: Tempest Cleric 1 / Great Old One Warlock 1 / Abjuration Wizard 10
Gale: Tempest Cleric 2 / Evocation Wizard 10
Shadowheart: Vengeance Paladin 6 / Divination Wizard 6
The party is now 67% Wizard at level 12.
Level 12, day 8.