How do you unlock mercenary in risk of rain 2?

Related questions

1. Does risk of rain have online multiplayer?
2. How much does risk of rain 2 cost?
3. Does risk of rain 2 have local coop?
4. What is the obelisk in risk of rain 2?
5. Will risk of rain 2 be on Mac?
6. Is risk of rain a roguelike?
7. Does Xbox one have risk of rain 2?
8. Can you play risk of rain 2 solo?
9. Can you beat risk of rain 2?
10. Is risk of rain on Xbox?

Tags

1. #unlock
2. #mercenary
3. #themselves
4. #there
5. #appear
6. #celestial
7. #disagreement
8. #obelisk
9. #players
10. #reaching
11. #sacrifice
12. #portal
13. #about
14. #through