Wow, this is very clever & super resourceful!Actually, you can fight him just like you would in every other mode if you simply place chests on your platforms. The bombs cannot blow up tiles holding a chest (even if it’s empty), so you can space them out and fight him like normal.View attachment 319603
(I used Dressers in the pic because they covered more space, so I thought they would more efficient. They were not.)
Now while that might sound incredibly resource-heavy, remember that Ore Veins are double-sized in FTW, and mining is incredibly fast thanks to the flimsy blocks. It only took me about 5 minutes of mining to get the iron needed for over 100 chests, which was more than enough to cover my arena.