My Isekai Life in Hard Mode

Refraction

Ryoshu's fingers tightened around the bowstring, a palpable tension coursing through his muscles as he prepared to unleash his devastating attack, "Impact." The weight of his impending action hung heavy in the air, his resolve unyielding despite the exhaustion gnawing at his being. Yet, after 14 seconds, a sense of urgency clawed into his consciousness as he felt his mana reserves dwindling rapidly, like sand slipping through his fingers. With a decisive flick of his wrist, he deactivated the invisibility mode of his mask, a practical concession to conserve his waning energy.

"Perhaps the invisibility feature saps more energy than I initially anticipated," he mused aloud, furrowing his brows in contemplation. Determined not to squander even a fraction of a second, he extended the charge time by six seconds, channeling Fire mana into the final arrow with practiced precision.

As he released the arrow, a dazzling blaze of orange-red light erupted from its tip, flooding the cavern with it