Um Alarez, I haven't seen here any fire schackles casters and archmage's staff secretly grants immunity to fire schackles.

just cast fire shackles and they're dead

Intresting facts, but hardly surprising. Hroll is OP even without all those & so is every single mage in the game for that matter. The battle would've been over in minutes if a Horror Mage would participate (reviving the dead human troops as Zombies) or if a Battle Mage was tossing burning ground spell at the skeletons, hence no mages in this one

Also I find it weird that no battle mage helps in such gigantic battle but I understand budget limitations.

Hroll equipped in just Black Blood Rune and Fury Totem (can be gained from previous mission) does insane amout of damage in melee while constantly healing. He only has normally a single second of cooldown. With banner he attacks every frame. Pictured here are only melee units. He would be even more overpowered with Archmage's Staff and Mecun Shield. You can find my steam guide on actual item properties of this game since I directly extracted them from game's soucre code. Did you know most of them actually secretly immunize to various spells?

why not make it into a fanudbbed movie? i know this thing is year old. But i can help you with that. Just join here https://discord.gg/ApucPMaC