The prophecy is not a spoiler. It is the source of the tension.
The chosen-one trope is the most frequently maligned structure in epic fantasy, and for understandable reasons. In its worst form, it is a mechanism for avoiding narrative consequence: if destiny guarantees the outcome, there is no real tension in the story, and the reader spends several hundred pages waiting for the protagonist to accept what is already written. The character who refuses the call — who spends three chapters insisting they are not special — is not a subversion of this structure. They are just a slower version of it.
The trope works when it is used as a source of conflict rather than a resolution of one. Prophecy is interesting when multiple parties believe different things about what it means, when the prophecy's ambiguity is structural rather than decorative, and when the question of whether the protagonist will fulfill it is genuinely open rather than predetermined by the genre.
Jordan understood this. Rand al'Thor's relationship with the Prophecies of the Dragon is tense across the full Wheel of Time because the prophecies are specific enough to be meaningful but ambiguous enough that their fulfillment is not obvious. Characters interpret them differently. History has distorted some of them. The reader cannot be certain, until the moment arrives, whether any given event counts. This is the mechanism working correctly: prophecy as constraint rather than guarantee.
The Kingsmen Chronicles handles this better than most modern epic fantasy. There is a prophecy. Multiple factions believe it refers to Elohl den'Alrahel. Elohl has not accepted this. The factions disagreeing about what the prophecy means and whether he is the person it describes creates genuine conflict — some want him protected, some want him dead, some want him to fulfill a specific role before he can be either. The reader spends the trilogy inside this uncertainty, which is a significantly more interesting place to be than inside a character who already knows their destiny and is just working toward it.
Ghrenna's prophetic wyrric gift adds another layer. She sees things — fragments of futures — and cannot always tell when they will occur or whether her knowledge of them will change them. This is prophecy at the personal scale, which is where it is most interesting: not as a cosmic guarantee but as a burden that must be lived with by a specific person whose information is incomplete and whose ability to act on it is constrained by everything else going on around her.
When the Kingsmen Chronicles resolves, the prophecy resolves with it. Whether it was fulfilled in the way anyone expected — that is the answer the trilogy earns. Start with Blackmark. The complete trilogy is free in Kindle Unlimited.