I found out and am just throwing this out there.Probably known, but just trying to help.
When he casts "Unknown Condition" on you, it's actually a Retrograde, or a Subversion.Both same thing.Make him attack you when you have it on and you'll get higher hp.Just NEVER heal yourself or a teammate with it on you or them, as it will just bring them lower.
So good luck, if you can't hit too high, just do it slowly, he's not all that strong.
He usually stupidly casts some DOT attack after giving me unknown condition, healing me for a lot each turn (Reversing the major damage it was suppose to deal)
If your a Psycho, just cast Retrograde on Clemons after he says "I can see right through you" then he changes form, when he does that he heals. And It turns into Damage and you hit him 45990 I think that is his major weakness =DDDDDDDD
Hmm, I never knew that Unknown Condition was Retrograde... Cool....
No... If you play on Heroic then Clemons will cast some Shadow damages which will not be affected by the Unknown Condition and you will continue to recieve DAMAGE!!!!
Because he'll keep spamming unknown condition on you, which heals normally, so you'll get damaged and killed rather quickly unless you can attack yourself...
A shadow psycho can lessen the effect with overdrive, and a bio can just disrupt for him to heal, but everyone else has a problem =/