The player's reasoning, if I may paraphrase, is that the spirit becomes part of the binder's "essential nature." I don't think this is the best way to look at it as it opens up other cans of worms. Your statement makes sense though.
Yes, exactly, that's the question I'm asking here. So, no RAW answer on this one then? Its yet another YSMV? This is frustrating.
The distinction, in warping points likely accumulated over time by a Binder, is significant. I know ArM5 isn't a "balanced" game the way, say, DnD 3.5 is, but still, I'm trying to keep this character on a relatively even footing with the other magus-level characters. If I allow him to do it without warping, does that make him way more powerful than someone focused on arts? If I force warping, does it make him way less powerful? I am an experienced GM of many systems, but ArM5 is uncharted territory.
The player was hoping for no warping at all, aside for the annual "constant effect" binding warping point itself. But I think he'd probably live with that ruling.
That was more the way I was reading the ability. But really, it could be either way in this "story" aspect, so if there is no RAW, the question for my purpose is, "which one is better?" in terms of the time invested in "learning to use" a spirit's power vs. learning hermetic magic.
Its ok if learning to use a spirit's power is as quick, or even slightly quicker, a route to power, given the story potential from infernalism and such, but if it is way more powerful, then it needs to be balanced out a bit in my game, and warping seemed the right way.
But, as we're all experienced rp'ers new to the system, I'm trying to stick to RAW as much as possible at this early stage. I'm sure my next ArM campaign will start with a 10 page list of house rules, but we need to learn how the machine was intended to work before we can start modifying it to our purposes.
Yes, that's what I meant by "circumstances where a warping point would be received due to a powerful supernatural effect." I left these related rules details out of my OP because, if I copied all the relevant rules from the book, I feel like I'm infringing on the rights' holder, and if I paraphrase too much, the conversation can get derailed over misinterpretations of my paraphrasing.
As for lvl 25+, of relevance to our story are things like "Leap of Homecoming."