Upper body shot of a dark, menacing mechanical knight engaged in a bosstyle boss battle, captured with the cinenematic style of a 4k movie still. The knight’s battle-worn, intricately designed helmet emits a dull glow from it's eyes and reflects the eerie glow of his weapon—a massive broad sword. The blade crackles with dark energy, gathering ominously at its tip where a glowing orb of dark purple and violet light pulses with immense, destructive power. The energy radiates along the blade, casting a sinister glow that illuminates the knight’s helmet and armor, creating stark contrasts between light and deep shadows. In his other hand, the knight wields a formidable shield, adorned with reinforced ridges and an arcane sigil. The shield exudes a sense of dread, as if imbued with powerful  magic, amplifying the terror of his presence. The sword’s glow casts intricate shadows across the shield, highlighting its menacing details. The chaotic battlefield around them is set amidst a background of fiery tornadoes intensifying the dramatic clash between the knight and his adversaries.