There are at least two artists who go by the name Lorn:

1) A pseudonym of USA electronic musician / DJ Marcos Ortega who debuted with 7 & 13 (EP) (Sep 2006, self-released). In 2010 he signed to Brainfeeder and his second album followed, Nothing Else (Jun 2010, Brainfeeder). In May 2011 he signed to Ninja Tune.

2) Lorn is a two-piece Italian black metal band founded in 1999. They have released three albums; "Towards The Abyss Of Disease" in 2008, "Subconscious Metamorphosis" in 2013 and "Arrayed Claws" in 2017.
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Artist biography from last.fm