Numerous bands share this moniker (in order of year band was founded):

1. Swedish Death Metal band, active around the early nineties.

2. Industrial Death Metal from Indiana, USA.

3. Melodic Death/Thrash/Groove Metal from Virginia, USA.

4. Black Metal from Leicester, UK

5. Post-Hardcore from Grand Haven, Michigan.
-currently active, related pages:
https://www.facebook.com/AdversaryMichigan
http://adversarymusic.bandcamp.com/

6. Heavy/power metal band from Palm Harbor, Florida, US, formed under the name Adversary in 1982. They began going by the Visigoth moniker in 1983, changing it again (to Charade) in the mid-1980s. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.