Resizing Weapon Property increases damage dice on polymorph forms
 

Giant Form I/II does not meld equipment into your form and weapons will receive the appropriate size increases. However, if the weapon also has the Resizing property, it doubles up on those size increases which results in incorrect results.

E.g., Medium race with Resizing Sonic Rifle does 2d6. Divine Vessel takes that to 3d6. Then Elemental Body IV (put gun down, pick up) takes it to 6d6. Everything’s great! However, if you pick “Giant Form II” and don’t put the gun down, now it shows as 12d6 (up 2 sizes higher than it should be).