Collecting essence from lamia seems impossible. It's definitely too hard. I have a question about the final boss. Is it available now and how many essences do you need to fight it? Will getting out of the boss end the game?
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Final boss is not available yet, the game is still mostly a sandbox-type game for now. Once the final boss is added then the game will have a conclusion, though after beating the final boss I will likely require the player to walk back to the diary space, allowing predators to be re-visited (including the final boss) and ending the game when desired.