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The Greathammer drop link sends you to a build page. Whoops.
For as rough as Eygon is, he is quite honorable. Protecting a broken woman despite her failing to fulfill her purpose of becoming a Firekeeper, and doing it while he seems very displeased and upset with that fact.
The Moaning Knight invades even if you turn Irina into a firekeeper (I also never killed Eygon), so his invasion has nothing to do with player choice; unfortunately, this seems to nullify to "slain Eygon" theory.
How do you get Eygon out of Firelink Shrine? Is it because I did Irina questline late and maybe possibly bugged? (Started doing it when I was looking for his summon sign in Lothric Castle)