The amount of mana-management and logistical planning that goes into a proper elven magical corps is nuts, and most books just skip right over it. They'll show these beautiful, shimmering barriers and volleys of light, but forget that every caster is probably running on fumes after twenty minutes of channeling. I just finished a series where the elves set up these ritual circles in advance, like magical artillery positions, and used singers to maintain the energy flow—it felt so much more grounded than the usual 'wand-waving and boom'.
What really gets me, though, is the interplay between different magical disciplines. Battle illusions to disguise troop movements, earth magic to reshape the terrain and create instant fortifications, then necromancy (if they're that kind of elf) to disrupt enemy communications. It’s not one big fireball; it’s a layered, combined-arms approach that mirrors real warfare, just with arcane principles instead of gunpowder. Makes the victories feel earned, you know?
Plus, the cost. Good authors remember that magic has a price, so you see elven ranks thinning as the mages sacrifice themselves to fuel a final, desperate working. That tension between their natural longevity and the sudden, violent expenditure of life-force is where the real epic tragedy lies.