Angel Island (IDW)

Angel Island is a location that appears in the Sonic the Hedgehog comic series published by IDW Publishing. It is a floating landmass above Sonic's world that is kept afloat by the Master Emerald. Both the island and its Emerald are safeguarded by Knuckles the Echidna, the island's main inhabitant.

Past
In the past, Knuckles the Echidna has guarded Angel Island. However, the island has been unguarded at various point whenever Knuckles, for one reason or another, had to leave his post. Most recently, Angel Island was left to itself after Knuckles left to command he Resistance.

Fallout
Angel Island's vulnerability was eventually discovered by the villain commandeering the Badnik hordes, who noticed that the Master Emerald would help accelerate their plans.