realistic Mercy from Overwatch as a Dungeons and Dragons Life Domain cleric in battle, fierce and radiant, wearing white and gold robes with glowing runes, silver and golden armor accents, long blonde hair flowing in divine light, wielding a radiant staff crackling with holy energy, raising her hand as beams of golden sunlight descend to heal allies, standing in a ruined battlefield surrounded by smoke and light, aura of divine protection and wrath, cinematic photorealism, ultra-detailed textures, dramatic lighting, volumetric light, ray tracing reflections, epic composition, depth of field, highly detailed environment, 8k, masterpiece, best quality