The story
Their first project (a real-time strategy, third-person shooter and role-playing game hybrid), Savage: The Battle for Newerth, was released in the Summer of 2003. They released its sequel, Savage 2: A Tortured Soul, on January 16, 2008, and independently published and distributed it. Their third installment in the Savage series, Heroes of Newerth, based heavily around Defense of the Ancients, was released on May 12, 2010.
In 2015, S2 Games sold the rights to Heroes of Newerth to Garena to focus on Strife, their second-generation MOBA.
Garena subsequently moved Heroes of Newerth to Frostburn Studios, a Kalamazoo, Michigan based subsidiary of Garena.
From Wikipedia’s article on S2 Games, shared under CC BY-SA 4.0.4