Leif Erikson's Arrows

Hello all! I understand if this is something of niche question, but I’ve looked around all over the place and I can’t seem to find the answer I’m looking for.

Does anyone happen to know the Item ID number for the arrows that Leif Erikson fires? I’m trying to use a trigger to get Ballistics to apply to a renamed version of Leif Erikson, but I’ve discovered that I need the trigger to apply to the projectiles he fires, not the hero themselves.

Thank you very much!