Hi 

In my last game the DM gave me a new magic item (longbow +2) but it doesn't act like a standard longbow and I'm having some trouble getting it working in DnDB - I've made the item public https://www.dndbeyond.com/magic-items/5153559-bow-of-the-aarakocra-2 

The idea is it produces its own radiant arrows when pulling back the string, but instead of dealing the normal 1d8 piercing damage it deals 2D10 radiant.  Upon a crit this would be 4d10 and then releases a second radiant dealing a further 2d10.  It should also be using the Wisdom modifier for its attack modifier.  

But I can't seem to get it set up correctly.  anyone able to assist ?

None of what you want is possible.

• It is not possible to change a weapon’s base damage.
• It is not possible to designate any weapon to use a score other than Strength or Dexterity.
• Temporary effects such as things which automatically happen on a critical are not currently supported on DDB.
• Once you publish something you can never take it down and you can never edit it. Published is permanent.

PS- Your link is broken. You have to delete the “ ” at the end. This one should work: (https://www.dndbeyond.com/magic-items/5153559-bow-of-the-aarakocra-2).