I'm developing a story about a few hundred modern day US Marines who are transported to a fantasy world and must do battle with an army of Orcs and dragons. I know they will be extremely effective at this (see: literally thousands of other questions). However, to keep things from being too easy on them I'm gonna use magic to even the odds a bit.
In the world they are taken to, wizards play an important role in combat, but are NOT so over powered that it becomes pointless to raise huge armies of knights and peasants. Therefore, I need to come up with spells and types of magic that would be useful against my few-hundred marines, but would NOT utterly destroy a standard fantasy army of knights, spearmen, orcs, dragons, and eagle-riding elves.
A few I've come up with:
- Stun/Disable all troops in an area: stunning or disabling a few dozen spearmen would be powerful in a fantasy battle, but not necessarily decisive. However, with the marines relying on a small number of elite troops with massive firepower, disabling most of them for a short time could be quite powerful.
- Interfere with visibility: Clouding the battlefield such that visibility is vastly reduced would be useful in a medieval-style battle, but would not prevent a melee army from being effective. However, by preventing the Marines from aiming it could completely disable their primary advantage.
- Controlling/Possessing: Being able to possess a single knight or dragon is good, but not all that OP. Being able to possess the gunner of an M1 Abrams tank could prove far more disastrous.
Can people think of any other spells that might prove effective here?