@humus666: satanas (also: satana) = nominative (a-declination --> -ae)
vobiscum (=cum vobis) = ablative, plural ; preposition'cum' always goes with ablative (therefore 'vobis' )
I wasn't a shining light in Latin, but the basic grammar I do remember well so nothing wrong with "satan with you" .... except for the ridicolous meaning :Smokin: