Sorry for the grappling arrow, where is the item (or equipment glyph if still called that) template located?
I don't mind the idea of just making that another 5 cost option that you could buy multiple of. I envisioned a recoiling one that is permanent when I wrote it up, but they could certainly be ones inn which you just get to where you are going and detatch, leaving it behind (aka one time use). I am not oppose to either option. In fact if there is not an easy option to add equipment to heroes during the drafting army part of the game, common one shot arrow just seems easier / cleaner.
For adhesive and flashbang, I was not sure if either were too restrictive since they negatively impact opponents to be common or should they be unique so your archer is not loaded with 3 each of these? I prefer common but made one each to get thoughts from the experts.
Both were intended to impact the chosen figure with one marker only.
For explosive arrow I went back and forth on 3 vs 4 attack dice. If 4 keeps cost at 5pts I love it, but would never pay 10 to get it to 4 dice. The idea was to shorten the archers range when using this arrow, but again I now think it is just cleaner to keep it as the Archer's printed range like the others.