alectryomancer
A practitioner of alectryomancy.
I was unprepared for the change in attire and started slightly when the alectryomancer reappeared.
Where it comes from
From Ancient Greek ἀλεκτρυών (alektruṓn), ἀλέκτωρ (aléktōr, “a rooster”) + -mancer, equivalent to alectryomancy + -er.
Adapted from the Wiktionary entry alectryomancer (CC BY-SA 4.0).