This location exists primarily or exclusively within the IDW Publishing continuity.
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
The Altar Emerald is a location that appears in the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing. It is a ruin where Sonic once encountered Gemerl.
Altar Emerald is a ruin made of stone with various engravings on its structures. It consists at least of a platform with pillars and railings on it.
At some point not too long ago, Sonic fought Gemerl at the Altar Emerald.