<>;A> <>;spell> <>;favoured> <>;by> <>;many> <>;and> <>;for> <>;good> <>;reason>. <>;While> <>;invisible> <>;you> <>;can> <>;move> <>;more> <>;freely> <>;and> <>;aggressive> <>;creatures> <>;do> <>;not> <>;attack> <>;you>, <>;unless> <>;they> <>;have> <>;the> <>;ability> <>;to> <>;detect> <>;an> <>;invisible> <>;entity>, <>;either> <>;as> <>;an> <>;inate> <>;skill> <>;or> <>;by> <>;means> <>;of> <>;a> <>;detection> <>;spell>. <>;The> <>;spell> <>;will> <>;run> <>;until> <>;its> <>;duration> <>;expires> <>;or> <>;the> <>;recipient> <>;commits> <>;some> <>;form> <>;of> <>;aggressive> <>;act>.