I'm still quite a new and very proud owner of 5* version of Namor. He is still only at rank 4/55 and unawakened.
I was testing him for a while in a few ROL Wintersoldier fights in a team synergy with OG Magneto, Cyclop blue team, Cap Am IW and Wolverine. I was not running suicidal setup for this testing.
After he gained 2 stacks of furies after 2nd sp3, I was able to reach crazy figures of damage. Almost 222k of dmg done by a single special attack 2 combo hit!
I was lucky as he got crits in all 3 hits of the combo (53k, 56k and 113k), but still I was amazed.
Check this out:
https://youtu.be/_Q3RRewJYVk@Lagacy has a video in his youtube channel about which science tier champ deals the highest dmg with his special attack. I think when he will deal with mutant tier champs, Namor will win it easily.