What is Tony Stark's heart made out of?

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Tags

1. #created
2. #source
3. #suits
4. #element
5. #power
6. #level
7. #movie
8. #first
9. #palladium
10. #stark
11. #later
12. #advanced
13. #initial
14. #reactor
15. #second
16. #improving
17. #modified