The Living Force
It's quite remarkable that you write about it today. Last night I dreamed that I was visiting a volcano and I also felt the smell of sulfur while I was sleeping. It is possible that I was dreaming about it even around the time you wrote this post.
I saw this thing in the sky on Tenerife, which is basically a huge dormant volcano. And there is now the La Palma eruption not too far away. Though volcanoes have a smell of sulfur too, so it may not be connected to anything else.