to be done
Ultimately
final demand (with a threat)
final
Final
final
'Bidding' perhaps as in "Such is my bidding to you" makes sense to me Ultimatum is another word for Final Demand
Ending
Effectuate, Absolute, Final, Finished
Alternate words for "final part" could be "conclusion", "finale" or simply "ending".
In the end - finally, at last, ultimately, in the final analysis
There isn't a final syllable in the word called. The word called is only one syllable. The -ed may make it sound like another syllable but it isn't.
final, concluding