Red mist

Ever since the attacks on San Francisco in 2014, the government has be hounding Monarch for the execution of the titans, especially Godzilla. However, after the fight between Muto Prime and Godzilla, within the 'rockies' mountain range in Alberta, Canada something changed. Radio-volcanic activity started happening. Then, in 2016, it erupted.

And the Crimson Comet shot into the Mesosphere.