A few Change in my Guide (01.05.2024):
Auction:
1. Soulelixier: 20-30 boerc.
2. Lave Stone: 40-50 boerc. (Edit: Important later to upgrade Fire Enchantment to Level 2 !!)
3. Murphy Hand: 70-90 boerc. (Edit: Recieved a Buff. It is now very usefull against Bosses, because you only recieve +2 Corruption per Fight instead +1 per Attack. Also adds +3 DEF!!)
It has become slightly more difficult to win on the first bit. Savescumming does not always help you. Still it is possible to get all item. Just bring a lot of beer and rum with you. Alcoholic drink help to increase your Lust toward 90-100 to get the maximum payment at the brothel.
Tree Monster:
HP Potion are more or less useless / too weak. Your Healing Spell "bind up" only works well enough with high END, DEF and INT. With high AGI you can also try to savescum to victory.
(EDIT: Since the Overhaul of the Combat System, this fight has become even more difficult without Goo-Armor. You definitly need to visit the Bathhouse to double your HP before the fight !! "Bind up" has become useless. Use your MP for Leaping Slash or Holy Fist instead. Try to deafeat him before your Lifepoints run out. If this is still not enough, return back later long after the war with improved Stats.)
On next Playthorough i may try out the fire enchantment.