Oracle / Seer / Diviner
Great flavour, lots of precedence in stories. But in practice if abilities didn't give us info/tantalising hints it was a waste of resources, and if it did then we'd skipped over fun adventure story beats.
On the one hand they are a great way for the GM to give you info and hints. On the other hand, they can feel like they short cut'd fun story-rich adventures to libraries and sages and NPCs with secrets we needed to know etc.