If you've seen the shamefully leaked PDXcon footage, you'd already know that brow-sweat is a flagship I:R feature

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Personally, I find this issue a particularly challenging one. I am not in charge of deciding what system we use - but I would still pick this one, myself.
'Mana' is traditionally the domain of a
Splendid Wizard. The name is misleading, but I understand the sentiment. Why do characters in MMOs have a health or mana value? It represents how close they are to death or exhaustion. Some games have done away with the concept, but I don't feel like grand strategy is the place for that.
Is it an abstraction? Sure. Is that bad? Not
necessarily. Many of the complaints I have seen about the power system, is that it was too broad, too nonspecific, and too ubiquitous. With many complaints over features, there are often amazing suggestions that go alongside. With power, I haven't yet seen a suggestion that I think adequately provides an alternative. Time gating as the only method, as any game developer will tell you, makes reactive gameplay difficult, especially in our genre. Random chance is utterly horrible (what's that? I got the wrong result, oh well, I'll alt-f4 and try again).
Abstraction is the domain of gaming - show me a game with none, and I'll be eternally grateful. Refer to bananas and chess comment in my previous post.
There are some in-betweens, and some decent ideas, but none which adequately represent what power
is, in my eyes. Power to me, is influence. It's a gameplay mechanic, certainly, but it has a representative purpose. The sum total of political or national influence in an arbitrary number of categories that you as the 'spirit' of your nation, through your puppet, the ruler, can extend over the forces in play within your empire. Caesar, despite what he would have liked people to believe, didn't have absolute control over his subjects - he had to constantly balance his political situation. I feel like the main thing to be careful of is not
having a power system, but how we use it.
What this is: my
personal opinions on the topic of power, or, as we apparently call it now, mana.
What this isn't: a blanket statement on the future of the game.
What this also isn't: confirmation of
Splendid Wizards.
Peter