As for the souls that I have, they are not affected by hell or anyother thing more differently as other souls that are in demigod bodies. Cause all of this souls already have a vessel(me), I don't see them leaving anytime soon. However souls will deplenish in the case of my character receiving a "fatal blow" or strong hits, you can call it my hp bar.
I'm not sure why they wouldn't be affected by Hell. The souls stored within you are still to be judged, those who fit the bill should rightfully be damned in Hell instead of stored within you. Since the souls you possess do not contain a divine spark, you cannot claim they are unaffected by Hell as all normal souls are indeed affected by it, regardless of where they are. To what degree varies with the soul. You may fight the pull Hell has on those souls, but you will have to RP out the effect the deeper you go if you wish to keep the souls. You're not the only one with soul harvesting powers in Hell, since Hell is essentially a collection of souls.
If I were to let this power get out of hand, then in such a case the quest would be over with your demigod absorbing all the souls in Hell and since you claim Hell has no effect on the souls you claim, then there is nothing I can logically do save for have Divine punishments kill your character until all the souls are depleted. Don't think I so easily accepted your character without considering the implications of having a soul manipulator in a realm of souls. I'm not THAT stupid, hence rule 6.
That being said, despite not having listed your ability to absorb souls to recover from fatal wounds, etc on the application, please quantify the number of souls you are currently carrying for this adventure through Hell should you wish to retain such souls, within a reasonable number please as you technically are not an immortal yet.
Is this reasonable and Fair?