The Shield Stone in A Resistance of Witches

What the Shield Stone Is

The shield stone is a smooth black pendant suspended on a silver chain. It was crafted by Lydia Polk’s grandmother, who was both an herbalist and a Projectionist—the same rare combination of magical talents that Lydia inherits. The stone is not simply a piece of jewellery; it carries a permanent enchantment that warps the wearer’s connection to one of the novel’s most dangerous forms of magic: projection, or spirit-travel.

When worn, the shield stone prevents the user from projecting her own consciousness outward. It also blocks any outside witch from using projection to spy on, follow, or attack the wearer. In effect, it creates a blind spot around the person wearing it—a one-way barrier that seals the wearer’s mind away from the psychic realm.

Where the Stone Appears

The stone is first introduced in Chapter Twenty-Four , when Evelyn Polk retrieves it from a bedroom drawer and places it around her daughter’s neck. Lydia is convalescing at her mother’s Hackney flat, unable to perform even basic magic after a binding spell has been secretly cast on her. Evelyn explains that the stone belonged to Lydia’s grandmother and that it will protect her from being watched by enemy Projectionists, such as the Nazi witches she already suspects are hunting her.

In Chapter Twenty-Five , Lydia continues to wear the shield stone as she recovers. It is explicitly linked to her newfound untraceability: the Nazi witch Gerda Horn has been stationed outside the flat to watch Lydia by ordinary means because magical surveillance no longer works. The stone is thus both a comfort and a marker of Lydia’s powerlessness—she is safe from detection, but she is also cut off from her own magic.

The most significant recurrence comes in Chapter Twenty-Seven , when Lydia prepares to return to France to retrieve and destroy the Grimorium Bellum. As she sits in Evelyn’s kitchen, she lifts the shield stone from around her neck and places it on the table. The moment she does so, her magic surges back into her veins, and she immediately projects to search for Henry and Rebecca. This removal is the turning point: the stone that had kept her safe and hidden now must be cast aside so she can act.

How the Meaning of the Stone Changes

The shield stone’s significance shifts across the arc of the story, moving from protection to confinement to choice.

Protection. When Evelyn first gives Lydia the stone, it is a gift of safety. Lydia has been helpless, bound, and terrified of the shadowy figures she senses in her room. The stone offers a concrete, tangible defence against an enemy she cannot see. It is a maternal gesture: Evelyn reaches into the family’s past to give her daughter a piece of her grandmother’s power.

Confinement. As Lydia wears the stone through her convalescence, it becomes a symbol of her weakness. She cannot project, cannot fight, cannot even scout the enemy’s movements. The stone that keeps enemy witches out also keeps Lydia’s own abilities locked away. It is a cage disguised as armour.

Choice. When Lydia voluntarily removes the stone, its meaning is remade again. It is no longer something that is done to her—it becomes an object she acts upon. Taking it off is an act of deliberate risk. As Evelyn warns, the moment the stone leaves her neck, the Nazi witches will be able to detect her. Lydia chooses vulnerability over safety, agency over protection. The stone thus becomes a symbol of the central dilemma of the novel: the cost of resistance.

Character Connections

Lydia Polk is the primary bearer of the stone. Her relationship to it mirrors her relationship to her own power—initially afraid, then constrained, and finally reclaimed. Removing the stone is the moment she fully commits to her quest.
Evelyn Polk is the giver. She preserves the stone for fifteen years after her mother-in-law’s death, knowing it may one day be needed. Her decision to pass it to Lydia is an act of a mother who cannot fight the war herself but can arm her daughter.
Lydia’s grandmother (never named in the provided chapters) is the maker. The stone is a link to a woman Lydia never truly knew—a Projectionist who used her gift to find soldiers on the battlefields of the Great War and who foresaw the need for protection against other witches.
Sybil Winter, though she never touches the stone, is its shadow. The stone was made to block Projectionists, and Sybil is ultimately revealed as a traitor and a powerful Projectionist in service of the Third Reich. The stone that would have kept Sybil out of Lydia’s mind is the same stone Lydia must remove to confront her.

Thematic Connections

The shield stone is woven into several of the novel’s major themes:

Betrayal . The stone is meant to protect against enemies, but when Lydia removes it she discovers that her greatest enemy—Sybil—has been an ally. The stone cannot defend against betrayal from within.
Sacrifice . Lydia must give up safety to achieve her goal. The act of removing the stone is a small but concrete sacrifice that foreshadows greater losses to come, including Evelyn’s death.
Power and Corruption . The stone binds magic, raising the question of whether power must always be controlled. Is the stone a wise restraint or an unnatural cage? The novel shows that binding magic can be done for protection (Evelyn’s healing tea) or for suppression (the unknown spell that initially bound Lydia).
Resistance and Resilience . The stone is the opposite of resistance. It is a hiding place. To resist, Lydia must emerge from hiding. Her resilience is measured not by how long she stays protected but by her willingness to become exposed.

Study Questions

Why does Evelyn wait fifteen years to give Lydia the shield stone? What does this timing reveal about their relationship?

Answer: Evelyn gives the stone only after she learns that Lydia’s magic has been bound by an enemy. The timing suggests that Evelyn has been keeping the stone as a last resort—an heirloom she hoped never to use. It reveals that Evelyn respected Lydia’s independence until she faced a threat that could not be ignored. The gift is a confession: Evelyn cannot protect her daughter with ordinary means, so she reaches for the extraordinary.
How does the shield stone specifically limit projection, and why is that limitation crucial to the plot of the second half of the novel?

Answer: The stone prevents the wearer from projecting and blocks incoming projection from other witches. This is crucial because Sybil Winter, the traitorous Grand Mistress, is a Projectionist. For the first three weeks of her convalescence, Lydia is invisible to Sybil’s surveillance. The stone buys Lydia time to recover, gather information, and plan the destruction of the Grimorium Bellum without Sybil knowing her exact location or intentions.
When Lydia removes the stone in Chapter Twenty-Seven, what does Evelyn mean when she says “they’ll be able to track you”? Who is “they,” and why does Lydia proceed anyway?

Answer: “They” refers to the coven of Nazi witches led by Ursula Wolfe, particularly Sybil Winter, who can now sense Lydia’s magical signature the moment she projects. Lydia proceeds because she has no other way to locate Henry and Rebecca or to reach the Grimorium Bellum before the winter solstice. She chooses the risk of detection over the certainty of failure. It is an act of calculated desperation.
Compare the shield stone to the binding spell cast on Lydia earlier. Both restrict magic, but they are treated very differently. Why?

Answer: The binding spell is a hostile act performed without Lydia’s consent, leaving her weak and helpless. The shield stone is a voluntary binding—Lydia can remove it whenever she chooses. The distinction is one of agency. The novel suggests that restriction of power is not inherently evil or good; it depends on who chooses it and for what purpose. The shield stone is given in love and removed in courage; the binding spell is imposed in malice and undone by truth (Gerda’s confession).