I noticed some Talents say they use an Aspect, while others spend and Aspect, and a couple risk an Aspect. I was wondering what the difference between these are.

Thank you for your question, and picking up Lost Eons! Spend and Use are the same- you sacrifice the specified number of Aspect cards from your hand to perform the Talent. “Risk” is a typo from a playtest that I managed to leave in by mistake. If I have the time to do a new edition I would correct all three terms to Use. I hope that that helps.