Direct answer
For a good-ending attempt, preserve checkpoints before Act transitions and record the values, Knight story outcomes, and epilogue state of the current run. Patch 1.0.10 specifically changed how the Act 3 assessment reads those values.
Build an ending-ready save set
Keep a clean save before the end of each Act and a second save before major personal-quest conclusions. Write down the Sovereign values visible in the current run rather than assuming New Game+ history is still part of the calculation.
Patch 1.0.10 matters
The official patch changed Merlin's Act 3 assessment so it uses the values of the current run instead of accumulated values across the entire save. Older ending discussions may therefore describe behavior that no longer applies.
Compare endings and epilogues separately
Record the main ending screen first, then list each Knight or regional epilogue as a separate state. This prevents route variations and character slides from being counted as additional main endings.
Frequently asked questions
How many endings does Sovereign Tower have?
Count the main ending screen separately from Knight epilogues and route variations. The route table is being organized with those categories kept distinct.
Why can an epilogue differ from an older guide?
Epilogue states can reflect current-run values, Knight story outcomes, and patch behavior. Compare your installed version and preserve pre-Act saves before assuming a route is broken.
Does New Game+ history affect the Act 3 judgment?
Patch 1.0.10 says Merlin's assessment should now use the values of the current run, not an accumulation across the entire save.