What did the hammering mean at the end of endgame?

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Tags

1. #placing
2. #goodbye
3. #being
4. #something
5. #endgame
6. #starting
7. #hammering
8. #sound
9. #saying
10. #created
11. #cinematic
12. #universe
13. #built
14. #credits
15. #marvel
16. #closes