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The war has begun and Elfina, Fiere, and Floresse, alongiside Luminous remained in the back. Luminous was still working even in the back, as he was conjuring long-ranged healing magic in the wounded elf troops, saving dozens of lethally wounded elves. Their numbers were way lower than the humans, preserving their lives was more important as well. However, Luminous also unleashed beams of light against the human army, defeating a dozen per beam. It was not the most efficient, but this was much as he could do from the long distance.
Check "The Protagonist's Sister Is Actually the Strongest"!