How do you unlock the paradox in Enter the Gungeon?

Related questions

1. How much does enter the Gungeon cost on ps4?
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4. Can I play enter the Gungeon online?
5. Is enter the Gungeon on Xbox one?
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Tags

1. #character
2. #defeat
3. #appear
4. #strange
5. #there
6. #first
7. #floor
8. #randomly
9. #three
10. #active
11. #entering
12. #chance
13. #unlock
14. #special
15. #floors
16. #bullet
17. #effect
18. #paradox