Decouple portents from foresight and vision.

[pyrrhicPachyderm]

It should be possible to use portents without visions. This could grant a limited amount of information, such as just the time and place of the event, or some inkling of what it is, increasing with more feats. This will grant a number of advantages.

• It fits with the traditional interpretation of portents far more closely. Traditionally, portents would not normally grant a full vision of the event foreseen. They'd just give some idea of what's to come.
• It would reduce the necessary set of prerequisites for interesting portent abilities. Currently, portents of locations you're not currently standing in require a massive set of prerequisites in scrying. By allowing portents without visions, this could all be cut out, allowing interesting portents to appear much earlier in a campaign.
• It would allow the power level of portents to be curbed significantly, making it fair for them to appear earlier in a campaign. Foresight is inherently a very powerful ability (partially due to the ability to have visions of your future self giving reports to your past self), and allowing some foretelling of the future (with portents) without full visions would allow interesting abilities.

Considerations:

• Make even basic foresight a higher level feat. Even at its very basic level, it's very powerful: before leaving your house in the morning, you can have a vision of sunset, and at sunset you can report anything interesting that happened during the day. Currently, I still want to give access to it early, as foretelling is a very traditional part of divination and should be accessible easily. By allowing foretelling in the form of portents, we can allow foretelling that's accessible immediately without all the power of foresight.
• Make portents work on the past. Using portents to detect past events would be very useful, and seems an obvious extension. I've not been able to add it yet, as the way hindsight works is so different from foresight as not to readily support portents. Decoupling them allows portents of the past far more easily.
• Consider whether searching your current location should still be the default, or whether searching your own timestream (as Portents of Self) should be the default.
• Consider the interaction with Perfect Positioning. The obvious first tier of portents would reveal when and where the event occurs (and thus would probably depend on Perfect Positioning). This would allow it to couple to foresight (in its current form) even without explicit coupling feats; you could simply use the info from portents to inform foresight. But portents giving blurrier information than you get from Perfect Positioning would seem appropriate, so it might be nice if portents have a mode that doesn't depend on Perfect Positioning.

[pyrrhicPachyderm]

It's likely that this will never need a feat explicitly linking portents to foresight, as discovering the time and location of an event through a portent will be sufficient to use foresight on it.

In one way, this is an advantage, as it helps to decouple the feat progressions of foresight and portents. In particular, you can use portents to find a location, then walk to that location, and use foresight without scrying to get a vision. As such, there's no need to keep the default for portents as checking only your current location, in order to help them connect to foresight. This may even allow portents to have varying default search locations.

On the other hand, this might be a disadvantage, as it'll require being very careful that feats for getting more information out of portents aren't made immediately redundant by using foresight to get a vision of the event.

This might be fixable by tying foresight and portent back together, but the other way around. That is, that you would need a portent of an event in order to use foresight on it: you couldn't just specify an arbitrary time for foresight. This solves the problem in the previous paragraph if all portents use the same set of feats for revealing further information about them, as then foresight can just be made the ultimate feat in that chain. However, it would be nice if different portents revealed different sets of increasing information (using different feats), in which case it would be harder to neatly put foresight at the culmination of every such feat chain.