Good day - been really enjoying backpack hero since I saw it on ManyATrueNerd - almost 120 hours of play time :) I have run into a potential bug on v0.31.4b - if you have the barbell and the lizard king sword, the energy reduction from LKS is undone at the start of each turn, even though it says "reduces by one this combat".
e.g. I have the jagged sword, it costs 2. I use LKS (at a cost of 3), jagged sword now costs 1. End turn, jagged sword is back to 2.