alastor

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a·las·tor

also A·las·tor  (ə-lăs′tər, -tôr′)
n.
An avenging deity or spirit, the masculine personification of Nemesis, frequently evoked in Greek tragedy.

[Greek alastōr, from alastos, unforgettable : a-, not; see a-1 + lanthanein, lath-, to escape notice.]

alastor

(əˈlæstɔː)
n
an avenging spirit or demon