Important Detail -
Do NOT consume the special ergo dropped from Bosses. There is a
total of 11 Special Weapons, and 10 of them are obtained by turning boss ergo into weapons. You will be able to obtain their ergo again in New Game+ and can make the weapons if you didn't pick them or choose to get the amulets.
The last special Weapon, "Golden Lie" requires you to "lie" throughout the game, or more accurately will require you to accumulate enough "Humanity".Here's a guide for all lie/truth choices/gaining humanity in the game, Created by WhyattThrash -
Telling truth/lies scenarios and gaining Humanity (SPOILERS)Additionally, Cloud Save Method, get 2 endings in 1 playthrough -
Solution for Real boy : They all lived happily ever after In Lies of PAt the end of chapter 4, after defeating the boss "Fallen Archbishop Andreus", you will run into the NPC "Alidoro" in the next room (can be met before beating the boss by taking an elevator that's on the way to the boss), and he will be the person who will turn your boss ergo into either a Special weapon or an amulet. He will eventually be at Hotel Krat regardless of whether you lied to him about a safe place. He'll be on the 1st floor, top left corner. You can only pick to get a weapon or amulet from a boss ergo, so
turn all boss ergos into weapons. Special Weapons -
1. Seven-Coil Spring Sword - Parade Master
2. Etiquette - Scrapped Watchman
3. Holy Sword of the Ark - King’s Flame Fuoco
4. Trident of the Covenant - Fallen Archbishop Andreus
5. Puppet Ripper - King of Puppets
6. Frozen Feast - Champion Victor
7. Two Dragons Sword - Green Monster of the Swamp
8. Uroboros’s Eye - Laxasia The Complete
9. Noblesse Oblige - Simon Manus Awakened God
10. Proof of Humanity - Nameless Puppet
This Special weapon is obtained by "refusing" to give your heart to Geppetto at the end of the game, which will have you fight the Nameless Puppet.
11. Golden Lie - Lied throughout the game/Gain enough Humanity
This Special weapon is obtained by choosing to lie throughout the game/gaining enough humanity. At the end of chapter 5, after beating the boss "Eldest of the Black Rabbit Brotherhood", the building in the front will open, the side room on the left there will be a large portrait of a boy, pick it up and bring it to Geppetto in his office. He will hang it up on the wall next to the doorway, whenever you choose to tell a lie, the nose on the portrait will grow longer. (It doesn't look like it grows with each lie, but story progression) Your appearance will also begin to change such as longer hair and turning white at certain story points, and this change is you becoming human.
Depending on how much Humanity you've gained, you will be able to obtain the Golden Lie even before beating the last boss, but you'll be near the end of the game nonetheless. If not, after beating the game, do not go into New Game+, choose not to restart and you will return to Hotel Krat.
You may or may not have enough humanity to get the Golden Lie. This is where the record player comes in, each record you play will give you humanity, and you only have to listen till you see the auto save on the top right of the screen (do it again if in NG+). Afterward, go into Geppetto's office and interact with the Portrait, and you will obtain the Golden Lie. Do NOT go straight into New Game+, depending on your choices/ending you can also get -
Rise of P Ending/Lying/“Give Sophia peace”
Real Boy Ending/Give Geppetto your heart
Any ending for this one!