Rules of the Second Age
I can see running this with a variety of rule-sets: d20, heavily-modified D&D, house-ruled Burning Wheel, high artha flow Sorcerer (& Sword) Maybe something else? The first two here are more differentiated by degree than type of rule-set. If we went the heavily-modified route, I’d be tempted to write a modified magic system that looked a bit like the stuff...