The Adepta Sororitas Imagifier in Warhammer 40,000 is a specialized Sister of Battle who plays a vital role in inspiring her sisters through acts of faith and the veneration of martyrs. She carries a sacred relic known as the Simulacrus Imperialis, which depicts a revered martyr.

Here's a detailed overview of the Imagifier:

Role and Lore:

• Imagifiers are living symbols of martial zeal and unwavering faith.
• They carry a large, stanchion-mounted graven image of a holy martyr into battle, serving as a "locus of faith" for nearby Sisters of Battle.
• By recounting the heroic deeds of fallen heroes, they rally and inspire their sisters, bolstering their courage and devotion.
• In the lore, they embody the fervent spirit of the Adepta Sororitas, with figures like Sister Tariana of the Order of the Thorn being legendary for their faith and combat prowess.

Gameplay Rules (10th Edition):

• Unit Composition: An Imagifier is a single model, typically equipped with a bolt pistol, boltgun, and a close combat weapon.
• Core Abilities:
  • Leader: Imagifiers can lead other Adepta Sororitas units, enhancing their abilities.
  • Acts of Faith: They contribute to and benefit from the Adepta Sororitas' core "Acts of Faith" mechanic, which involves generating and using Miracle dice to influence key rolls during the game.
• Key Abilities:
  • Litany of Deeds: This powerful ability allows you to re-roll the resulting Miracle dice before adding it to your pool whenever an Adepta Sororitas unit or model within 12 inches of the Imagifier is destroyed. This helps in generating more favorable Miracle dice.
  • Stanchion of Holy Martyrs: When leading a unit, the Imagifier grants models in that unit an improved save of 2+ and a 4+ invulnerable save. This significantly increases the durability of the unit she is attached to, making them much harder to remove from the battlefield.
• Acts of Faith Interaction: Imagifiers have access to the various "Acts of Faith" blessings and oaths, which can provide benefits like ignoring modifiers to characteristics, Weapon Skill/Ballistic Skill, and rolls, or improving Armour Penetration and gaining Miracle dice on enemy destruction.

Model and Availability:

• The Imagifier miniature from Games Workshop features a dynamic sculpt.
• The model is characterized by a large relic icon mounted atop an hourglass-like stanchion, often depicting a full-body figure of a martyr.
• Its prominent silhouette makes it taller than standard Sisters of Battle models.
• Assembly typically requires careful securing of the banner for stability.
  

Overall, the Adepta Sororitas Imagifier is a crucial support character for any Sisters of Battle army, providing significant defensive buffs to her unit and enhancing the army's ability to generate and utilize Miracle dice, all while embodying the unyielding faith of the Emperor's chosen warriors.