What reading level is Invincible?

Invincible by Sherrilyn Kenyon is at a Level 4-5 reading level (Lexile 610L). Recommended for Upper Grades readers (Ages 13+).

What age is Invincible appropriate for?

Invincible is recommended for Ages 13+. HootRating: 9ME (Moderate — Emotional). Content flags: Fantasy Violence, Physical Danger, Fear & Anxiety.

What genre is Invincible?

Invincible is fiction. Part of the Chronicles of Nick series.

Does Invincible have any content warnings?

Invincible has a HootRating of 9ME (Moderate — Emotional). Content flags include: Fantasy Violence, Physical Danger, Fear & Anxiety. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

Reviewed by HootRated editorial · Last updated May 18, 2026

Invincible

Sherrilyn Kenyon

Invincible

Age Rating, Reading Level & Content Guide

by Sherrilyn Kenyon

Chronicles of Nick

Reading Level 4-5 9ME Ages 13+ Matched

The text is written at a 4th grade reading level, the subject matter is intended for teens (ages 13+), and the content has moderate intensity with some emotionally heavy themes.

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About This Book

After surviving a terrifying zombie attack, Nick Gautier faces challenges at school and uncovers mysterious secrets while racing against dark forces to control the power of the undead. With danger looming from demons and shape-shifters, he must find strength and courage to protect his soul. Adventure and suspense build as Nick fights to stay invincible.

Themes

Adventure Fantasy World-Building Coming of Age Friendship

Quick Assessment

This is a Level 4-5 book with moderate content intensity. Content themes include fantasy violence, physical danger, fear & anxiety. Written for readers ages 13+.

Why we rated Invincible 9ME

Invincible is written at a Level 4-5 reading level with a Lexile measure of 610L (approximately 69,169 words). Strong independent readers around grade 5.4 can typically handle this book on their own; with parent or teacher support, Invincible works for readers up to grade 6.4.

Read aloud, Invincible runs about 7.7 hours — long enough to span several bedtime sessions.

We rate Invincible as 9ME ("Moderate — Emotional") because the content sits in the "Moderate" range — moderate conflict that may involve loss, scary scenes, or interpersonal stakes. The strongest signals come from emotional weight, physical peril — these are the dimensions parents should evaluate against their reader's tolerance.

Specific content flags noted by reviewers: Fantasy Violence, Physical Danger, Fear & Anxiety.

Thematically, Invincible explores adventure, fantasy world-building, coming of age, and friendship — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 13+ range — the maturity and attention span match the story's pacing.
✓ Readers who like a steady plot with enough momentum to keep pages turning.
✓ Kids drawn to stories about adventure, fantasy world-building, coming of age.
✓ Readers who fall hard for one book and want a long series to live in — there are 7 more books in the Chronicles of Nick series.

Maybe not for

! Readers who get easily upset by emotional or moderately dark scenes — the conflict here is real, not just background flavor.
! Children who are sensitive to violence, even when handled at age-appropriate levels.