In Stars And Time - Secret Boss and Achievement

MAJOR SPOILERS FOR ACT 6 IM BEING VAGUE FOR A REASON
This is just intended for people who don't wanna go through the trouble of actually getting to access the secret boss, along with some extra optional dialogue with Odile (unlocked by getting the Kinda Sus Achievement and then getting to the end of Act 6) at the end for good measure

HOW TO CHALLENGE THE SECRET BOSS:
ok so literally I had some weird "loop is real 2401" bullcrab written here before when it's literally so simple. Just make ABSOLUTELY sure to interact with siffrin's silver coin in ACT 4 until they get a flashback, then immediately talk to Loop. If you've done that, you can just get to the epilogue, save, get to the credits, and then reload that epilogue save. Afterwards you can just go to the Favor Tree and you'll know what to do from there. Sorry about the wild goose chase if you were here before!