Suggested by Random Esdeath is a powerful foe whose speed is fairly good and her mastery of ice is very impressive. However, the villains in One Punch Man have a tendency to be fairly strong and Lord Boros is at the top of the food chain. His speed and power are off the charts to the point where Esdeath will have a hard time reacting to Boros at all. The difference in their physical abilities will prove to be too much in the end and that’s not even considering the fact that Boros could return someday in a stronger form. Boros wins.
DReager1.com 
I agree. Boros will most likely win against Esdeath. Even with her bloodlust to kill and ice powers, I’m not sure if it’s enough to defeat a superpowered alien. Boros can also regenerate himself and power up to the next level. He might as well be saiyan from Dragonball Z.
Absolutely, he was certainly very impressive and one of the coolest One Punch Man characters. It’d be great to see him reappear someday and get a rematch, but what we got was already one of the best fights in the series.
Yeah he was strong. He was like the only guy actually survive a one punch attack. He is truly a fearful foe to encounter.