Board Thread:Speculation House/@comment-27883360-20160305074527/@comment-28951333-20160707043258

Maybe Ren has been using his semblance in fights, though? True, we have never seen him use it, but in almost every fight he has been in (to my recollection - it is late and I am tired) he has gotten exhausted/passed out when all other fighters have been seemingly fine. Ren sure as heck isn't out of shape, so he must have been exhausting himself in other ways. We have seen with other people  who have gotten the wind knocked out of them after using their more powerful semblances. I'd like to think that he has been enabling his semblance to protect his friends all along, and whatever his semblance may be, it could be (and in my mind, probably is) what completely drains him physically.

With this in mind, maybe his semblance boosts the semblances/auras of his teammates? It would explain why he is usually the first one to exhaust himself in a team battle. This would also complement his symbol, as the lotus symbolizes purity and detachment. What's more pure and detached from oneself than healing others? As an example, and this is not for Renora's sake, but because it is the most obvious example for me to think of, Nora's semblance seems overwhelmingly OP (at least to me). This could be due to all of the time she has spent with Ren over the years.

I'd like to think that healing/helping/boosting others is Ren's semblance because it seems to fit his personality so well.