Aside from AoE damage, another idea if it is possible would be to give the [Arrow Knight] the ability to deal area denial damage, where they will fire incendiary arrows that will set the ground on fire when fighting against other enemy units on land. The fire caused by this incendiary arrow will rapidly spread out to a certain radius and last there for a certain amount of time, causing damage to any enemy unit that stands in the fire.
I remember making a post in 2022 where I suggested that a new technology called the “Carcass Shot” could be researched from the [Arsenal] building, which would give the [Mortar] the ability to fire this carcass shot that would cause area denial damage. I was inspired by this old post of mine for suggesting that the [Arrow Knight] could deal area denial damage.