A massive undead dragon with exposed ribs, torn leather wings, skull-like face, green necrotic fire burning inside its chest and throat, bones assembling and cracking as it moves

A massive undead dragon with exposed ribs, torn leather wings, skull-like face, green necrotic fire burning inside its chest and throat, bones assembling and cracking as it moves
0–4s: rises from beneath an ancient European city square, cobblestones exploding upward, bones flying together in mid-air to complete its skeleton, camera starts in tight ground-level close-up on skeletal claws breaking through stone, then tilts up to reveal the full dragon; 
4–10s: breathes ghostly green fire across cathedrals and old streets, raising undead soldiers from the ground as buildings crumble, camera orbits around the dragon’s wings while necrotic flames spread through rooftops and statues collapse into dust; 
10–15s: lands on the cathedral roof, crushing it completely, then spreads its wings above thousands of undead kneeling below, ending with a dramatic crane rise showing the entire gothic city falling under its command as green fire burns in every street
Dark fantasy daylight haze, bone assembly VFX, ghost flames, crumbling stone, undead army reveal, cinematic supernatural scale.