Fishnado Staff is a post-Superancient summon that is the EX variant of Tempest Staff. Compared to its predecessor, this summon shoots sharkrons much quicker and they deal more damage.
Its best modifier is Ruthless for highest damage output or Mythical for a wide stat array of bonuses except critical strike chance as minions cannot deal critical hits. Aside from these, Mystic or Masterful are also the best with high damage, reduced mana cost and knockback.