Warstaff (Warhammer/staff combo). Call of the Storm is five feet even. It is an archmage’s staff that has been modified into the Warstaff by adding a Warhammer’s hammerhead and infused with magical reserves.
What if some crazy wizard created an artifact that empowered rodents that touched it with one random supernatural power? Preferly right out of the pages of your favorite four-color. (But only one power!) This item does not convey any sort of intelligence boost.