call [calls](beckoning or summoning) noun [UK: kɔːl] [US: ˈkɒl]
invocation [invocations](act or form of calling for the assistance or presence of some superior being) noun [UK: ˌɪn.vəˈk.eɪʃ.n̩] [US: ˌɪn.vəˈk.eɪʃ.n̩]
summons [summonses](call to do something, especially to come) noun [UK: ˈsʌ.mənz] [US: ˈsʌ.mənz]