Shimmer Arrow

The Shimmer Arrow is an Arrow obtained by throwing a wooden arrow or a hellfire arrow into the Shimmer. It's effect is that it's falling effect is in reversed gravity, going upwards at an angle instead of downwards.

Regarding The Daedalus Stormbow:

The arrows shoot downwards from the sky and if not destroyed by hitting a surface the arrows will turn around and fly until opposed or fly into space.