A man with a sword and a glowing orb in his hand

Create a captivating and mystical digital artwork that immerses viewers in the dark and awe-inspiring world of Warhammer 40,000. Depict Sebastian, the legendary psyker and devoted follower of the Emperor of Mankind, as a central figure radiating an aura of immense psychic power. Sebastian should be clothed in an imposing obsidian-black raiment robe, symbolizing his connection to the enigmatic forces of the warp. His attire should be adorned with the distinctive psykana collar, an emblem of his psychic abilities and devotion to the Emperor. Around Sebastian's wrist, floating crystals of psychic energy, known as "Assail," should spiral with otherworldly grace. These crystals, highlighted by intricate detailing and vibrant colors, should exude a sense of psychic might. Illustrate them homing in on a target, capturing the moment of psychic precision as they lock onto their objective. Illuminate the scene with a dramatic display of "Smite" — a ferocious bolt of psychic lightning that courses through Sebastian's outstretched hand. The crackling energy should be vividly rendered, casting an eerie glow on his determined face and the surrounding environment. Bring forth "Brain Rupture," a devastating psychic ability, as Sebastian directs his formidable powers toward a foe. Visualize the impact of this power, distorting reality and causing anguish to his target, as if their very mind is being torn asunder. Consider the setting: Is Sebastian standing in a sacred chamber adorned with the Emperor's symbols, or is he amidst the battlefield, wielding his psychic prowess against the forces of chaos? The environment should enhance the sense of mysticism and power. This artwork should encapsulate the essence of Sebastian as a legendary psyker, channeling his psychic gifts in service to the Emperor. Let your artistic vision bring to life this awe-inspiring character in a manner that pays homage to the rich lore and visual aesthetics of the Warhammer 40,000 universe.