Electric or lightning arrows. That would rule, imagine an enemy in a large puddle or somethning (theres some in Eldin Province on that part of the Field near the bridge) and you fired a lightning arrow at the water and the enemy or enemies were all killed by the electricity as it hits the water. I like the fact we didnt have fire, ice and light arrows as weapons in Twilight Princess. Light arrows rule though tbf. I hope theres some magical arrow or arrows in the next one.