Tower of Trials Solution (Floor 31): 3X T3 Senior Hammer Knight, 3X T3 Senior High Elf Archer (Physical Immune)

Disclaimer: This solution may be one of the many ways of beating the floor in question. For more/alternative solutions, please visit the solution megasheet. 

No Admission: 5-6 Star Units

My Solution: T3 Senior Orc Hammer Unit, T3 Senior Great Hammer Unit, T3 Senior Hammer Knight, 4X Black Magic Wizard, and T3 Senior Frost Mage

Difficulty (possibility of this solution not working out): High, there is quite a bit of luck riding on it

Logic: Despite being immune to physical attacks, you will want a Senior Orc Hammer Unit and a Senior Great Hammer Unit in there to eat up the damage and buy your DPS some time. The bulk of the damage will be dealt by the Frost Mage and the Hammer Knight. The reason why luck is a factor here is because you're counting on the skill attack of the Black Magic Wizards to proc (cursed enemies have a chance to miss their attacks). Proc at the right times and your units will breeze on through. If not, expect to run this level 3-4 times.

A (possibly) trick 200 gems

Have your own solution you would like to share? Leave us a note in the comments section below!