Warlord has a nice ring to it,
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Captain wouldn't be horrible, though it being an actual rank implies that all such characters belong to some sort of military hierarchy.
Or "Field Marshall" Erwin Rommel, with his tanks and jerry-cans.Marshal is just awful, I hope they don't go with that and the image of tin stars and six guns it conjures up.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.