black mass 
noun
A travesty of the Roman Catholic Mass in worship of the Devil.Would the devil worshipers ever perform black masses?...
- So many occult practices emphasize the inversion of the natural order - recall the black mass in which the Catholic mass was chanted backwards.
- He swears we will witness a black mass and some manner of hideous human sacrifice.
- right bank
- right bower
- Rightboys
- Right Boys
- right brain
- right-branching
- right-center
- right-centre
- right circular
- right-circularly
- right-click
- right corner
- right-cornered
- right croaker
- right descension
- right deviationism
- right deviationist
- rightdoer
- right-doing
- rightdoing
- right-down
- right-eared
- righten
- right enough
- righteous