The link to join the discord group is not working for me, but I like the endless mode. Here is my final build (I've had the tab open in a browser and played it on and off yesterday and today):
I think the build focuses on farming slimes and other creatures that can be endlessly weakened so they do no damage. Once the target is neutralized, then the tome can be used to stack as much mana as you will need until the next chance you have to farm (look ahead at the map). Once I get the mana bank high enough, I switch over to the potion cycle to farm for golden whetstone (it is important to have an open 2x2 next to the bracelet for the big curse while doing this part). The net result is you can over prepare for anything with as much mana as you need and then dealing damage to all enemies with the Skull Wand (which has been augmented with the golden whetstones). Round one kills of any enemies you can't farm (bosses included) are possible, but this strategy does make the game less exciting... I was just curious if it would work, and it does as of v.07