Cyphers
Cyphers are one-use abilities that your character has, and they change from session to session. This spices up the game because you always have new options for dealing with challenges—you have different tricks up your sleeve each time. Maybe a cypher lets you turn a combat encounter into a negotiation or reveals information about your foes and how they tie in to the overall story.
Cyphers are things that a player might do by asking the right questions or rolling well, presented as a one-use character ability that explicitly tries something cool and different. There's a lot of stuff on your character sheet that you can consistently rely on—skills, Pools, abilities, and so on; cyphers are the wild cards that give you fresh options and let you try something new. There are many different cyphers, and while none of them will break the game, they will be useful and interesting.
Many cyphers are the sort of thing that a realistic hero in a film or television show could do without any supernatural help, like having a burst of insight about the best way to use the nearby terrain, getting a surge of adrenaline to accomplish something exceptional, or being lucky enough to make that once-in-a-lifetime shot. In some ways they're like a capability you had within yourself but can't always rely on. Which means they're pretty realistic, because on a typical day you might not be able to jump over a fence, make a half-court shot, or evade a dangerous driver on the highway, but on the days you do manage one of those things, it's memorable.
You should think of cyphers less like gear or treasure and more like character abilities (from your type or focus) that you didn't expect to have. The cyphers lead to fun game moments where you can say, "Oh, I've got a trick that'll help with this situation," and that trick is different every time you play. The cypher might be intuitive knowledge of the local computer network, calling in a favor from the Faerie Court, or an explosive device. It might be a hot-wired teleporter or a force field with just enough battery to last a few minutes. Or a powerful electromagnet or a prayer that cures disease. Cyphers keep the game fresh and interesting—your character has different options in every session.
Another way to think of cyphers is that they make a scenario fun and cool, but they don't permanently change what your character is capable of. For example, an action movie franchise might frequently show that the hero is a skilled gunner or driver, but there's only one movie where they have a gunfight while climbing a steep cliff, and in that scene the hero had a couple of moments where they slipped and almost died. In game terms, the hero is trained in guns and driving, not in climbing, but they had a cypher that made a climbing task merely difficult instead of deadly.