Does anyone know if the abyssal power spent on potions permanently gone or is it returned to you at the end of its duration? It fluctuates so much between turns I haven’t been able to tell
Abyss Power is an Upkeep, the one on the Left, it should not exceed Total Abyss Power on the Right or you lose the game.
You get more Total Abyss Power from destroying statues, some bosses and if you build Abyss Trees on the Farm you are going to get a permanent increase of Total Abyss Power at the cost of Threat.
What raises the Upkeep is capturing more heroines, especially if they are not corrupted or masked and have high resistance.
Some building upgrades in your based is a permanent increase of Upkeep, like the brothel ship has 1000 Cost that could lose you the game, there isn't a way currently to deconstruct upgrades.
In the case of potions it is a temporary increase while it is active.
You basically need to farm with Abyss Trees if you want to afford the upgrades.