Come on buddy. Stop calling the mage tower a challenge - it was a complete afk faceroll.
When I did the havoc challenge, I used potion and meta, got boss down to 10% before my stun wore off and phased it.
Used drums on second phase, killed boss (without meta) before any adds even spawned.
Be realistic. The mage tower was just a participation trophy.
The most skillful part of me completing the havoc mage tower was walking to the auction house and buying a potion and drums.