Delving into the realms of dark fantasy and suspense, K.J. Sutton's "Endless Terrors" is a compelling narrative that lures readers into a meticulously crafted world of shadows and mysteries. K.J. Sutton, known for her ability to weave suspense with fantastical elements, does not disappoint with her latest offering. The novel stands out not only for its intricate plot and complex character developments but also for its exploration of deeper themes such as fear, survival, and the human condition under supernatural stress.

The story of "Endless Terrors" revolves around the protagonist, Elara, a young woman who suddenly finds herself ensnared in a series of supernatural predicaments that challenge her understanding of the world and herself. The initial setup is gripping: Elara wakes up in a strange, decrepit mansion with no memory of how she got there. This classic premise quickly spirals into a unique blend of horror and fantasy as Elara encounters other inhabitants who are equally lost and looking for answers.

One of Sutton’s strengths is her character development. Elara, as the central figure, is intricately portrayed with layers of complexity and resilience. Her evolution throughout the novel—from a bewildered survivor to a determined seeker of truth—is portrayed with a psychological depth that engages the reader emotionally. The supporting characters are also well-developed, each adding to the eerie atmosphere and contributing to the novel’s themes of survival and betrayal.

The world-building in "Endless Terrors" deserves a special mention. Sutton crafts an enthralling setting that is both claustrophobic and expansive. The mansion, with its endless rooms and corridors, operates almost as a character in its own right—mysterious and menacing. Surrounding this central locale are the woods, described with such palpable dread that they almost seem to encroach upon the reader’s comfort zone. This setting effectively enhances the story’s tension and mirrors the internal turmoil of the characters.

Plot-wise, "Endless Terrors" is meticulously plotted with twists that are both surprising and satisfying. The pacing is masterful, with a slow build-up of tension that culminates in a series of climax points that are both terrifying and revelatory. Sutton leverages a multitude of horror and fantasy tropes, which she refreshes with original twists that keep the reader guessing. The use of suspense is particularly noteworthy; it is neither gratuitous nor overly withholding, striking a balance that keeps the pages turning.

Thematically, the novel explores deep and sometimes dark questions about human nature. Fear, the most pervasive theme, is examined not just physically but psychologically, exposing the primal instincts that come into play when humans confront the unknown. This psychological exploration is nuanced, avoiding cliched conclusions and instead presenting fear as a multifaceted emotion that can drive as much as it can deter.

Yet, "Endless Terrors" is not without its minor flaws. Some readers might find the extensive use of flashbacks slightly disorienting at times, although they are essential for character backstories and plot revelations. Additionally, while the linguistic style is generally fitting, there are moments when the prose becomes slightly overwrought, which might detract from the urgency of the narrative for some.

In conclusion, K.J. Sutton’s "Endless Terrors" is a formidable entry in the dark fantasy genre. It successfully combines horror, mystery, and a touch of the Gothic to create a novel that is both entertaining and thought-provoking. Fans of Sutton’s previous works will undoubtedly find this to be a satisfying continuation of her style and themes, while newcomers will appreciate the standalone nature of its story and execution. With its dynamic characters, haunting setting, and clever plot twists, "Endless Terrors" is a journey worth taking for those who dare to face their fears illuminated only by the dim, flickering candle of Sutton’s narrative prowess.