This is definitely my messiest build since I accidentally stumbled upon a loophole with the Hourglass Relic when trying to do a magic run. Despite the +200% Bonus Damage, the main problem with the Hourglass is that my weapons will become useless over time due to losing -1 Damage permanently every time I used it.

That is until I found out that the Eternal Shiv from Eternal Staff and Eternal Blade from the Blade Summoner doesn't permanently receive the -1 Damage after the battle ended.
Also even though the Eternal Blade uses 2 energy per attack, I've gotten Shield Spirit Relic as one of my second drops and found out that if I use a shield with the Eternal Blade next to it, it would use that weapon for just 1 energy. And since the Windmill increases my energy from 3 to 4, that means I can technically use Eternal Blade 4 times in a single round. Which is how I immediately blitz through the King before he gets to summon anyone.
Another Relic that I got from the King that help me get through a few floors in Endless Mode is Sandwich combined with Old Log and Seasoning, which let me heal up 15+ HP with every Herb, and even more with any other consumables. Shame that it didn't last me long enough since I don't have anything to continuously prevent Poison Damage and it ended my run when it went over my Max HP.