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Magical trench warfare: Asking for sugestions
(ttrpg.network)
A place where Game Masters, Dungeon Masters, Storytellers, Narrators, Referees (and etc) can gather and ask questions. Uncertain of where to take the story? Want to spice up your big baddie? Encounters? That player? Ask away!
And if you have questions about becoming a Game Master you are most welcome with those as well!
Rules
I would watch Tanya the evil for creative inspiration. You pretty much just described the show.
As far as tactics, I would watch a lot of YouTube videos on mob tactics in DnD. Mob tactics can be really hard to get right for the specific context of scenario, so you'll have to watch a few videos before finding a method that works for you. I've personally found a mix of roll together and individual plays can be good, like squad based turns pretty much. But that was for a Melee war scenario I did. IDK how to make it work when long range is something everyone on the battlefield has.
Maybe look into how Warhammer 40k is played, could give some inspiration for home brew rules to make the combat smoother.