There are at least three bands called Usurper.
These are photos from concerts where Usurper played, so they may be of other bands that played the concert as well.
California Deathfest 2 Oct 14 - 16, 2016 Oakland, California, United States Uploaded by Bigtravsburnerphone
Cradle of Filth / Christian Death / Usurper Dec 18, 2000 Glasgow, Scotland, United Kingdom Uploaded by John Collins
Cradle of Filth / Christian Death / Usurper Dec 17, 2000 Manchester, England, United Kingdom Uploaded by John Collins
Cradle of Filth / Christian Death / Usurper Dec 16, 2000 Wolverhampton, England, United Kingdom Uploaded by John Collins
Milwaukee Metalfest XII Jul 24 - 25, 1998 Milwaukee, Wisconsin, United States Uploaded by Rottenbot
Dark Funeral / Usurper / December Wolves / Hemlock / Divine SIlence Nov 13, 1997 New York, New York, United States Uploaded by Denial Omega
