[Corrupted] mobs?

Ive seen some blue mobs today with a [Corrupted] tag over them?
some part of an event or what?
seems to be close to a paragon in stats I think
 

crazy-horse

Master
Its part of the easter thing. Collect the eggs, turn them in at the Grove of Easter (place in the southwest corner of hedge maze).. get enough, get a prize. I'm wondering why it hasnt been advertised this year.
 
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