Cosmo Thunder Spear vs Nebula Prism Nova | Marble Race Physics Simulation Tournament | Echo Arena Mode

English AI-generated marble race and physics simulation tournament video.
Format: 4 contenders, HP battle system, shrinking arena, and sudden-death pressure.
Featured contenders: Lunar Thunder Spear, Cosmo Thunder Spear, Aurora Blade Cyclone, Nebula Prism Nova.
Grand final matchup: Cosmo Thunder Spear vs Nebula Prism Nova. Champion: Cosmo Thunder Spear.
Rules: every fighter starts with 100 HP, collision damage accumulates, and the last survivor wins.
Keywords: marble race, physics simulation, ASMR collision sounds, HP tournament, AI battle shorts.
AI-generated content disclosure: enabled.