
neurosis |
I actually had this come up in a game recently and I allowed it as a +1 enhancement to avoid certain stacking issues. So if the player got it on a +1 bow it still cost 6,000 - which I think is reasonable since it's roughly as powerful as most other +1 enhancements.
Personally though I've played two archers and just used a wand for Gravity Bow and buffed myself pre-emptively. With 750gp cost for 50 charges, it's 15gp per cast. So it would take 8 wands and 400 fights to get to 6,000 gold. Now with a 1 minute (10 rounds) duration you don't use it more than once per fight and you can risk using the wand early on because losing even 3-4 rounds is no big deal. I ended up buying 3 wands over the course of an entire campaign and spent the extra weapon enhancement on making the bow +1 flaming/frost instead.
I think a Wand of GB and a +1 flaming bow is more powerful than a +1 bow with GB enhancement. In the fights that really count you will always pre-buff anyway.
For a ring I don't know if it's overpowered but it means the DM really has to plan encounters around the fact that there's an archer running around with a 2d6 base damage, 110ft range attack as standard that stacks with weapon enhancements - also why the wand is more scary to me than a permanent weapon enhance.