There are multiple groups named Hellstorm:
1) Hellstorm was a Finnish black metal band found in 1984. Hellstorm ended quite soon, but the guitarist Agathon continued with his musical projects, and later Gloomy Grim was formed. The folklore tells, that Hellstorm was the first black metal band in Finland.
2) Hellstorm is a Norwegian black metal / thrash metal band formed in Hommelvik, Norway in 1997.
3) Hellstorm is a crust band from Greece. See http://crust-demos.blogspot.com/2009/04/hellstorm-demo-2009-highly-recomented.html for details.
4) Hellstorm is a Thrash…
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