There are multiple artists with this name:

1) Moroi was a blackened death metal band from Tarnobrzeg, Poland. They formed in 1999 comprising of Art (Vocals), Kenneah (Guitars), Lukas (Guitars), Kościu (Bass), Blady (Drums) and Tibor (Keyboards).

They released one demo called "Painful Decadence" in 2005 before splitting up.

2) Moroi was a old school death metal from Poland, Lowicz. They released one demo called "Rothkarth" in 1995 which incorporated a lot of doom and black metal elements within their music. They unfortunely split up in 1995 after the release of the demo. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.