Supersonic Biome

A supersonic biome is a biome that can replace the Corruption in Large Hard Mode Worlds. It is the counterpart to the Stomach. Entering the biome inflicts Supersonic, which makes the player fifteen times as fast. All enemies are as fast as the player, making it hard to navigate for both.

After defeating Plantera, Supersonic biome will become Hypersonic, inflicts Hypersonic, thirty times as fast. Twice as strong enemies and a "final boss", a buffed Commander with twice the statistics. Enemies that were called supersonic are now hypersonic, and are 30x speed.

Structure
The Supersonic Biome contains no chasms, just flatlands.

Enemies
Supersonic Agent Supersonic Butterfly Supersonic Worm Supersonic Archer Supersonic Summoner
 * 200
 * 40 atk
 * 4 def
 * 100
 * 60 atk
 * 10 def
 * 300
 * 30 atk
 * 30 def
 * 400
 * 60 ranged, 10 contact dmg
 * 20 def
 * 30
 * 40 minion damage, 20 contact dmg
 * 25 def

Boss
Supersonic Commander
 * 20000
 * 60 minion dmg, 40 ranged dmg, 30 contact dmg

Plausible Soundtrack
Aboveground theme

Underground theme

Boss battle theme - commander

Boss theme - commander II