That sounds fine, I'll trust you to be forward when it comes to where things are too much. It's just that Prephlin quite literally feeds off the pain and suffering of sentient individuals under certain principles, often being physical. I'll just play it kind of slow and will avoid certain places/things should it be necessary.

I'll explain with the Earth thing. The species of Earth aren't bound to this planet by contract. When procreating with one such being, the offspring will only be 'half-bound' in certain respects. This is how Pahn allowed their birth as he wasn't someone to limit the freedom of lovers and possible children who would hardly have the same strength as their parents. They were less and less bound to Earth with each successive generation.

You probably said 'nearly', I'm guessing I just missed it and jumped a little too quickly on the word 'invulnerable'. This was my fault, but clarity never hurts as I'm sure we both understand lol. 

And thanks! Haven't had a chance to respond to PM's, I will soon. 
I'll talk more on it, but, I appreciate the suggestions and critiques like crazy! I very much so need lessons such as those. Thank you very much for taking time to write them out and thanks especially for being so specific. I'll definitely take it to heart in comfortably integrating it into my writings. :D

Also, I hardly mind whatever tense you write in. Just do whatever you're comfortable with, you're an excellent writer regardless.