signature specialisations doesn't complete

I have found more items with "infamous" or "of infamy" yet i'm stuck at 4/5

<blockquote class="imgur-embed-pub" lang="en" data-id="a/mHXZBwL" ><a href="//imgur.com/a/mHXZBwL">Infamous</a></blockquote><script async src="//s.imgur.com/min/embed.js" charset="utf-8"></script>

That specific "of Infamy" mod is a native mod for claws.

https://poedb.tw/us/Claws#ModifiersCalc