How did I get Bonus Infamy?

So same as I have "+" signs next to friendly factions where I used mandates and writs... I noticed that my character has a similar "-" icon with the Undead. On mouse rollover, it says "Bonus Infamy 50%"
I dunno how I got this - because as far as I can remember, it has been there since I first made contact with the Undead. I am on just Hated level with them (my Blademaster is still just Level 58), so it wasn't me killing their Nemesis that made this happen. What did I ever do to the undead to deserve their hatred?

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How did I get Bonus Infamy?