When you cast Luminous Strike, you channel the nurturing light of the Radiant Flame through your being, focusing it into a beam of pure, radiant energy that you direct at one creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d8 radiant damage, as the beam illuminates and burns the creature with the gentle yet powerful essence of the Radiant Flame.   If the target is an undead or a creature of darkness (at the DM's discretion), the Luminous Strike instead deals 1d12 radiant damage, as the purity of the Radiant Flame is especially potent against such entities.   At Higher Levels: The spell's damage increases by one die when you reach 5th level (2d8 or 2d12), 11th level (3d8 or 3d12), and 17th level (4d8 or 4d12).  

Special Notes: Luminous Strike is a manifestation of the Radiant Flame's dedication to healing and protection, designed not just to harm but to cleanse and purify. The radiant light emitted by the spell serves as a symbol of hope and resilience, driving back the darkness and reinforcing the sect's commitment to being a beacon of light in the world. This cantrip exemplifies the balance between strength and compassion that followers of the Radiant Flame embody.