Pretty sure you just had to activate the vendor like any other. If I recall, it was glitched for quite some time however - I received it randomly after an update where several other grimoire cards showed up.
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Edited by iBeRash: 1/9/2015 9:18:33 PMSucks for me then. That makes two I don't have because of glitches (also missing the [i]Ghost Fragment: Darkness 3[/i] card because I can't get the Lunar Complex dead ghost). :(
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Oh ok well if that's the case I probably got it like you did. One day I just got a crap ton of grimoire unlocked.