Is there anything that creates an item without energy cost?
I know keg exists but that costs gold.
I think the other options are the Old Log (which I didn't get a proper chance to use yet, 2x1 creates a herb) and the Cauldron (2x2, heavy, creates one random potion, one use per battle)
Edit: but they still cost energy so maybe I didn't help :/ I don't remember seeing anything apart from them, though. Would the Pickaxe count?
nope. and there likely wont be, a 0 cost item producing item could honestly be like cleaver type breaking stuff, even if it's a 1 use per turn thing
imagine you have 3-4 spices, ~150 max hp, and a 0 cost 1 use per turn item that produces something like a consumable...
it'd be pretty difficult to die in that scenario, before the tougher endless floors anyway