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The following information is based on events in The Secret Society of Seven Sorcerers and contain spoilers.
The incantation of the death spell are Abeo Modo, which is in Latin. Translated to English it means "die instantly." Abeo has multiple definitions, including "be changed", "depart, go away", "go off, go forth" and "pass away, die, disappear". Modo simply translates to "instantly" or "right now."