Tactics against Brontors...

[GodClone]

You don't need any army actually, use 1 archdemon for his high initiative, cast invisibility on him and kill them with spells . (u can use more than 1 if u plan to do damage with them )

Actually you can do the whole game like this, (for enemy heroes use 1 or more black dragons and thats it ) For spells use geiser, fire rain etc . i found Geiser to be the most op spell in the game , at my game end it did 11k dmg max to 8 units stacks (including gremlin towers and bosses ) .