The Mentor Problem: Why wise mentor characters always disappear

Hello friends!! Welcome to my new series: The editor’s lens! Where I will categorically pull apart things that I see in books that… well, actually, just really annoy me. Study them. And then put them back together! Today I’m talking about the Mentor Problem, and why wise mentor characters always disappear.

If you read enough fantasy, you start to notice a pattern.

The wise mentor appears early in the story. They guide the protagonist, offer advice, maybe deliver a few cryptic warnings… and then, at some point, they disappear.

Sometimes they die. Sometimes they leave. And sometimes they’re simply removed from the story at a very convenient moment. (Convenient for the plot, not the protagonist.)

And it happens so often that it stops feeling like coincidence.

From Obi-Wan in Star Wars to Gandalf in The Lord of the Rings, mentor characters rarely make it all the way through the story alongside the hero.

At first glance, this can feel frustrating. If the mentor is the most experienced and capable person in the story, why remove them just when things become most dangerous?

But from an editorial perspective, that pattern exists for a reason.

The mentor is usually the most competent person in the room

Mentors tend to have one defining trait: They already know what they’re doing.

They’ve lived through similar conflicts, they understand the rules of the world, and they often have more skill, more knowledge, and more experience than the protagonist.

Which creates a problem.

If the mentor stays active in the story, readers start asking a very simple question. Why isn’t the mentor solving this?

If Gandalf is present, why isn’t he leading the mission? If Obi-Wan is alive, why isn’t he confronting Darth Vader himself? And if Dumbledore is so powerful (and has the Elder wand), why isn’t he fighting Riddle?

The more capable the mentor is, the harder it becomes for the story to justify why the protagonist is the one taking the lead.

And that’s where the tension begins to break down.

Removing the mentor forces the protagonist to step up

This is the main reason that mentors disappear. Their absence creates space for the protagonist to grow.

As long as the mentor is present, the protagonist has someone to rely on, defer to, or someone who can step in when things go wrong.

Once the mentor is gone, that safety net disappears, and the protagonist is forced to make decisions on their own — often before they feel ready. This is what transforms them from someone being guided through the story into someone actively shaping it.

You can see this clearly in Star Wars, where Obi-Wan’s death marks the point where Luke can no longer rely on him for direction. Or in The Lord of the Rings, where Gandalf’s fall in Moria forces the Fellowship to continue without their strongest guide. In the series that shall not be named, this is the point where Harry has to step up and actually search for the horcruxes on his own (although Hermione is often there as the brains — and common sense — behind the trio).

In all of these cases, the story becomes more uncertain, and that uncertainty is what drives character growth.

The timing of the mentor’s exit

A mentor’s exit is never late, nor is it early, it arrives precisely when it means to.

When the mentor disappears too early, the protagonist may feel underdeveloped. When they disappear too late, the story can feel unbalanced.

The most effective mentor exits tend to happen at a turning point in the story, often just before or during the transition into the second half.

At this point, the protagonist has learned enough to survive… but not enough to succeed easily.

Which is exactly where the story wants them. Stripped of guidance, but not without tools they need to succeed.

Modern fantasy complicates the mentor role

While classic fantasy often relies on clearly defined mentor figures, modern fantasy (particularly romantasy) tends to complicate the role. And to note, complication is not a bad thing in this scenario! I mean it in that it makes the mentor role more complex than it has been historically.

Part of this shift comes from a growing awareness of what the traditional mentor figure represents. Because for a long time, fantasy has leaned heavily on a very specific archetype: The wise, older, usually white, male mentor. The patriarchy’s grandfather.

You see it across many foundational stories:

• Gandalf in The Lord of the Rings.
• Obi-Wan Kenobi in Star Wars: A New Hope, which then changes to Luke in episodes 7-9
• Dumbledore in that series
• Even in Magician by Raymond E. Feist the structure centres around older male authority figures guiding younger protagonists through a world they (the mentors) already understand

These characters are often positioned as the holders of knowledge, the interpreters of prophecy, and the moral centre of the story. And, crucially, the ones who already know how the world works.

From an editorial perspective, this creates two issues.

First, it reinforces a kind of narrative hierarchy where authority, and often wisdom, is concentrated in a very narrow type of character.

Second, it can limit the protagonist’s growth if the mentor remains the one who truly understands the stakes.

Modern fantasy has started pushing back against this.

We see mentors who are wrong and biased, who withhold information (although this is Dumbledore’s entire personality), or mentors who are no longer the most powerful person in the room.

In A Court of Thorns and Roses, Rhysand begins as a guide, but he’s not a neutral authority figure as he’s also protrayed as the villain. He’s embedded in the politics of the world and actively shaping it. This is the same as Xaden’s character in Fourth Wing.

In Nevernight, the idea of a single, stable mentor figure is fractured entirely. Guidance comes from multiple places, and none of them are fully reliable.

And in many newer stories, the “mentor” role is distributed across several characters rather than concentrated in one all-knowing figure.

This shift matters, because once the mentor stops being the unquestioned authority, the protagonist has to do more than just follow instructions. They have to interpret the world for themselves.

And that’s where stories start to feel more complex, and often, more interesting.

When the trope goes wrong

Like many common tropes, the “disappearing mentor” can feel formulaic when handled poorly. And one of the clearest signs of this is when the mentor’s death feels less like a turning point, and more like a convenience.

In From Blood and Ash, the early loss of Poppy’s instructor is designed to push her into independence. But because the relationship hasn’t had enough time to fully develop on the page, the emotional impact doesn’t land as strongly as it could. The removal feels structurally necessary, but not yet emotionally earned.

A similar issue can be seen in Throne of Glass. While not a traditional wise mentor, Arobynn, who trains and controls Celaena operates within that authority space, and the violence she experiences under that system highlights a different problem entirely. When mentor figures exist primarily as obstacles or sources of trauma without depth or complexity, their removal (or downfall) doesn’t create meaningful growth. It simply clears the board.*

In both cases, the issue isn’t that the mentor disappears. It’s that the story hasn’t done enough to make that disappearance matter. For a mentor’s exit to resonate, the relationship needs weight. It needs time. It needs emotional investment.

Otherwise, the loss doesn’t feel like transformation. It just feels like timing.

* To be fair to Maas, I am specifically speaking about the book Throne of Glass, not the series. I do think she comes back to this in The Assassin’s Blade.

When mentor’s don’t disappear (and why that can work)

While many stories remove their mentors, some choose to keep them, and that can be just as effective. The difference lies in how the mentor is used.

If the mentor remains in the story, they need to stop being the solution to every problem. This can happen in a few ways:

• the mentor becomes limited (injured, restricted, or removed from direct action)
• the mentor’s knowledge proves incomplete or flawed, or
• the mentor and protagonist begin to disagree

In these cases, the mentor shifts from authority figure to complicated ally. They’re still present, but they’re no longer the answer. This allows the protagonist to grow without needing to remove the mentor entirely.

One of the more interesting shifts in modern fantasy (again, particularly in romantasy) is that mentors don’t disappear anymore. Instead, they evolve. Sometimes they remain in the story but lose their authority. Sometimes they become equals. And sometimes, they transform into something else entirely.

In ACOTAR, Rhysand is someone who understands the world Feyre has been thrown into and helps her survive it. But over time, that dynamic changes. He stops being a distant, all-knowing mentor and becomes an active participant in both the emotional and political stakes of the story, and eventually, becomes the love interest. The mentorship doesn’t disappear. It evolves into partnership. (Let’s forget about Silver Flames for now.)

A similar dynamic plays out in The Belgariad with Belgarath the Sorcerer. He remains present throughout Garion’s journey, but crucially, he doesn’t solve the central conflict for him. He slowly reveals the truth of Garion’s identity, steps back at key moments, and allows Garion to make mistakes. To learn on his own. (He’s the Dumbledore that doesn’t leave, but also, is better.)

In The Witches of Eileanan, Meghan the witch also maintains a guiding presence, but her role is not one of constant rescue. She exists within the same dangerous world as the protagonists, and her guidance doesn’t remove the need for independent action. Instead, she has her own tasks to do and is a fuller character with her own faults and biases because of that.

In Nevernight, Mercurio initially fills the mentor role for Mia, teaching her how to survive in a brutal world. But the narrative voice itself complicates this structure. Mr Kindly, as a constant presence, offers commentary, guidance, and perspective, but not in a way that replaces Mia’s agency, and they constantly disagree and bicker. The mentorship becomes fragmented, layered, and far less authoritative than in traditional fantasy.

These examples work because they all do one thing: They remove the mentor’s ability to solve the story without removing their presence entirely.

In conclusion

Mentors don’t disappear because stories don’t value them. They disappear because the protagonist needs room to grow.

A strong mentor figure gives the protagonist the tools they need to survive the story. But at some point, survival isn’t enough.

The protagonist has to make their own choices. Face their own consequences. Become something more than what they were at the beginning.

And they can’t do that if someone else is still leading the way.