To easily defeat nearly every floor of the Treacherous Tower, use the Great Spin attack and Tornado Rod together. Since most enemies will charge at you, use the Tornado Rod to stun them. Then, charge the Great Spin Attack and unleash it to take out almost every enemy on the field. Repeat this until you defeat every enemy on the floor. Note: This doesn't work well for only a few floors, such as ones that have ice enemies (which require a fire attack to defeat).