The terms used are "conjurés/conjuration" (from Google: Middle English (also in the sense ‘oblige by oath’): from Old French conjurer ‘to plot or exorcise’, from Latin conjurare ‘band together by an oath, conspire’ (in medieval Latin ‘invoke’), from con- ‘together’ + jurare ‘swear’.). It seems to imply something more than just gather together for self-defence.