Averter

[f. AVERT v. + -ER¹.] He who or that which averts, or turns aside.

1621.  Burton, Anat. Mel., II. v. I. iv. Averters and purgers … to divert this rebellious humour and turn it another way.

1875.  Farrar, Seekers, II. v. 248. Plato says, ‘Go to the rites of expiation, go as a suppliant to the temples of the gods, the averters of evil.’