Not actually a blog post about MotU. Sorry. Talking about the Immortal Rules, the I of BECMI.
I've only gotten a few pages into the book. I've been pretty busy converting my classes from face to face to online. That, and Netflix. But I did get through the first few pages.
So I kind of knew this already, from my previous perusing of my PDF version, and from what others had told me about it. When your PC achieves immortality, their XP total is converted to Power Points at a rate of 1PP per 10k XP. So starting immortals have a few hundred PP, depending on their class/level when they achieved immortality.
When you convert your character, and play as an immortal, these PP are EVERYTHING. They're still the "xp" you collect, or rather XP you continue to collect is converted to PP. But you can also earn them in other ways, by advancing your personal goals and the goals of your Sphere.
PP are your hit points, as well. The only way to truly destroy an immortal is to reduce them to 0 PP.
PP are your spell points. You can cast any spell, and create plenty of other powers, by temporary expenditure of PP. These come back in time.
They are also character build points. You can improve your character, construct your own Outer Plane, create artifacts, and make other permanent changes/improvements through permanent expenditure of PP. In fact, the "advancement table" looks fairly easy to achieve, until you read the rules about needing minimum stats in certain ability scores to advance, which require these permanent expenditures of PP.
So while I have looked at the sections on using ability scores as % chance to perform "godly" tasks (which is pretty loosey-goosey story gamey, or at least it appears to be in the Players Book), and the section on the new saving throws, the main take-away so far is that Power is the metric of the immortals, and it's what drives the game.
Cool. And I'm gonna wait until I get through everything, but I've got an inkling that these PP based character mechanics might possibly work for a Supers game or maybe something like the Ambers in Zelazny's books. Yeah, there's Amber Diceless for Zelazny, but I don't have it and have never seen it.