You can only deal damage when namor is under a dot, aegon applies a very short duration bleed at the end of sp2 which is the only period of time you can actually inflict some damage. The fight will be painfully slow
Absolute NO on Namor. Not preferable on Attuma, Stryfe, and Diablo. However, you can try these with Aegon and let us know how many revives it took.
There is some information on Namor in this thread. What is the strategy for Attuna, Stryfe and Diablo - WITH OR WITHOUT Aegon? Any advices would be greatly appreciated.
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https://docs.google.com/spreadsheets/d/190f-pSuAyDAW2kHDBSX-F8vjCa35vbjkYQ11v5aFTno/edit#gid=796166882