My favourite magic cliche is the enchanted shrines, weapons and icons.
I don’t know if I read it or saw it in a movie, but I’ve had an idea in my head for a long time. Zombies, raised from the dead, and packed with explosives. When the mages throw fireballs the zombies go BOOM. Some have fuses hanging out of them so they are time-bombs. They can be catapulted at castle walls or used as sappers. How many bonus points do I get?bonus points to those who use explosives