How to Outline a Romantasy: Two Arcs, One Spine, and the Order They Have to Peak In

Key takeaways

• Two arcs, one spine. A fantasy structure supplies the plot; Gwen Hayes' four phases supply the relationship.
• They must interlock, not alternate. Every escalation in one should raise the cost in the other.
• The Black Moment lands before the climax, around 75–80%. The protagonist fights the final battle carrying that loss.
• The obstacle must be structural, not a misunderstanding one honest conversation would end.
• The magic needs a price. Powers without costs produce plots without tension — and in romantasy the price is usually what the relationship has to pay.
• Budget 100,000–130,000 words. Two arcs need room, and this constrains the first act hard.

Why the two-arc problem is genuinely hard

In a fantasy novel with a romance subplot, the romance is a reward. It can be cut, moved, or shortened, and the book survives. In romantasy it cannot: the relationship supplies roughly half the escalation and almost always the emotional climax.

That means every structural decision has to be made twice, and the two answers have to agree. Where is the midpoint of the plot? Where is the midpoint of the relationship? If those are 12,000 words apart, the book has two soggy middles instead of one turning point.

The pattern readers came for — the ACOTAR and Fourth Wing shape — solves this by making the arcs the same events seen from two angles. The trial that proves the protagonist's power is the same scene that reveals the love interest lied. One scene, two escalations, no wasted chapter.

The spine: pick a fantasy structure first

Choose the plot spine before you touch the romance beats, because the romance has to be laid over something.

Both of these work:

• Hero's Journey if the protagonist physically leaves an ordinary world — the most common romantasy shape, and it gives you a threshold crossing that doubles beautifully as the first real intimacy.
• Save the Cat if you want percentage markers, which is genuinely useful here since you are coordinating two timelines and need shared coordinates.

If you are unsure, the head-to-head comparison of the eight structures covers when each is the wrong tool. For romantasy specifically, avoid the Fichtean Curve: opening in crisis leaves no room to establish the attraction, and attraction established in a panic reads as trauma bonding whether you intended it or not.

The relationship arc: Hayes' four phases

Gwen Hayes' Romancing the Beat divides a romance into four phases, and it is the most useful frame available because it is about states of the relationship, not about events, which is exactly what you need when the events belong to the plot arc.

Phase	Roughly	What is true of the relationship
Setup	0–20%	Both leads are complete people with something missing they cannot name
Falling in Love	20–50%	Proximity forced by the plot; attraction becomes a problem
Retreating from Love	50–75%	The cost becomes visible; both start protecting themselves
Fighting for Love	75–100%	The Black Moment, then the choice that earns the ending

The two structural facts to internalise:

The midpoint of the relationship is the moment love becomes a liability. Up to 50%, falling in love is a pleasure with an obstacle. After 50%, it is a cost — something the protagonist would have to give up to win, or something that makes them vulnerable in a way the plot will exploit. If your relationship midpoint is just "they kiss", you have a beat, not a reversal.

The Black Moment must be structural. It is the point where the relationship looks irrecoverable, and it has to be caused by something real — competing loyalties, an actual betrayal, a genuine incompatibility of goals. Not a misunderstanding. A Black Moment that one honest conversation would dissolve is the single most common reason a romantasy ending feels unearned, and readers of this genre are unusually good at spotting it.

The interlock: where the two arcs must touch

This is the actual craft. Four points where the arcs are not merely adjacent but load-bearing on each other.

1. The forced proximity (around 20%). The plot decision that launches the quest is the same decision that traps the leads together. Not coincidence — causation. She joins the war college because it is the only route to the answer she needs, and he is the instructor. One choice, both arcs started.

2. The shared midpoint (around 50%). The best romantasy midpoints do three things in one scene: reverse the quest goal, make the relationship a liability, and reveal information that recontextualises both. This is the hardest scene in the book and worth a week of outlining on its own.

3. The Black Moment (75–80%). Relationship at its lowest, and it should be caused by the plot — the loyalty the quest demands is the one the relationship cannot survive. Now the protagonist enters the final act having already lost the thing they most wanted to protect.

4. The climax (85–95%), in this order. Plot climax second. The relationship crisis breaks first, the protagonist walks into the confrontation carrying it, and the resolution of the plot is what makes the relationship's repair possible.

Reverse those and the book deflates. Resolve the romance before the battle and the battle has no emotional stake left; resolve it entirely after, and you have written an epilogue where a climax should be.

Four ways romantasy outlines classically fail

The alternating draft. Quest chapter, romance chapter, quest chapter. Diagnose it by asking of each scene: does this advance both arcs? If more than a third of your scenes advance only one, they are two books sharing a cover.

The consequence-free magic system. Sanderson's first law in the form that matters here: the reader's satisfaction with a magical solution is proportional to their understanding of the magic. In romantasy there is a second requirement — the price should be payable by the relationship. Magic that costs the protagonist a memory, a year, or the ability to touch someone is magic that does structural work in both arcs at once.

The unearned third act. Symptom: a Black Moment resolved by a conversation. Cause: an obstacle that was never structural. Fix it in the outline, not the draft.

The first act that ate the book. Romantasy needs to establish a world, a magic system, two full characters and the beginnings of attraction — and writers give it 35% of the word count. At 120,000 words that is 42,000 words before the quest properly starts. Set your act-one budget as a number before you draft, which is precisely what beat sheets with word targets are for.

The genre promises you do not get to break

Three, and they are contractual:

1. A satisfying romantic resolution. Readers of this genre arrive expecting the couple to end up together. A subversion reads as a breach, not as daring, and no amount of craft will change that reception.
2. A magic system whose rules hold. Established rules, consistently applied, with a cost.
3. A relationship obstacle worth the page count. See the Black Moment above.

You can be surprising inside all three. You cannot be surprising about them.

Putting it on the page

Practical order of operations for the outline:

1. Write the premise sentence containing both arcs. One sentence, one conflict, both stakes. If the romance does not appear in it, you are writing fantasy with a subplot — which is fine, but outline it as that.
2. Pick the fantasy spine. Hero's Journey or Save the Cat.
3. Set the target word count, then convert every beat percentage into a real word number. At 120,000 words the midpoint is 60,000 and the Black Moment is around 90,000. Now they are deadlines.
4. Place the four interlock points first, before any other beat. They are the load-bearing walls.
5. Fill in the plot beats, then the relationship phases, checking at each that it changes something in the other arc.
6. Write the story bible cards you will otherwise contradict: what the magic costs, what each lead wants versus needs, and the timeline.

CipherWrite's Romantasy kit does steps two through six as a unit: it runs both arcs on one spine, seeds the story-bible cards, and fills a per-project Blueprint with the beats already converted to your word targets. It sits alongside the Romance kit (Hayes' four phases straight), Fantasy, and six others in the catalogue at cipherwrite.com/book-outline-templates — the full text of every template is readable without an account, and applying one to a project is the Pro feature. We walked through all seventeen in 17 book outline templates compared.

For the underlying craft, the two long guides worth the time are the romance and romantasy beat sheet bible and the world-building master blueprint, the latter for the magic-system-with-a-price problem specifically.

One structural note about where the outline lives

A romantasy outline is unusually spoiler-dense. In a hundred words it contains the betrayal, the Black Moment, and who ends up with whom — which is to say, it contains everything the reader is buying the book to discover.

Worth deciding on purpose, then, where that document sits. In CipherWrite the Blueprint is a separate encrypted document rather than scaffold chapters inside the manuscript, which keeps the beats out of the draft and the export, and keeps the plot of your unpublished book off a server in readable form. The reasoning is the same one in why an encrypted writing app matters.

The short version

Two arcs, one spine, interlocked at four points. Relationship midpoint makes love a liability. Black Moment is structural and lands before the climax. Magic has a price the relationship can pay. Budget the first act in words, not vibes.

Get those five right in the outline and the draft is a long job rather than an impossible one — which, for a genre that routinely runs 120,000 words, is the difference between a finished book and the fourth abandoned one. If abandonment is the more familiar pattern, start with why most novels die in the middle instead; no outline survives a writer who has stopped opening the file.