1. a person who calls upon or appeals to someone or something for help, support, or inspiration
2. a person who cites or refers to something as justification or support
3. a person who calls forth or brings about something

Examples

• The invoker of ancient spirits chanted in the moonlight.
• As an invoker of constitutional rights, the lawyer made a compelling argument.
• The invoker called upon the gods for protection during the ritual.
• She was known as an invoker of peace in times of conflict.
• The invoker of the emergency protocol acted swiftly.
• He served as the invoker of tradition at the ceremony.