You got me curious about something…

Oxford English Dictionary - Aura, 2.c.

[year] 1870–

A supposed subtle emanation from and enveloping living persons and things, viewed by mystics as consisting of the essence of the individual, serving as the medium for the operation of mesmeric and similar influences.

”Peculiar substances can be charged with the efflux or aura of the human being.”

P. B. Randolph, Seership! (1884)