I made a bunch of arrows today, ranging from hickory to yew, with bronze, platinum, adamantium, cobalt and titanium heads. I took the levels of those and they can be found
here. I found that the only thing that determined the level of the arrow was the type of wood used. Yew arrows have a level requirement of 17. But then I went on and added different enchantments level on them to make a chart and noticed that with the enchantments, the yew arrows dropped level requirement considerably.
Arrows/Bolts with Elemental Enchantments|hickory|oak|mahogany|Yew
Lesser elemental enchantment|8|10|10|11
Moderate elemental enchantment|8|10|10|11
Intermediary elemental enchantment|11|13|13|13
Greater elemental enchantment|?|?|?|?[/table]
Is this normal?