User blog comment:BarrelHornet3/Hidden Kill Count for Pawn Bestiary Knowledge/@comment-5166842-20130719161659/@comment-13763093-20130822044400

i posted this in the silver/golden knight page;

I'm pretty sure that one of the requirements is 100 kills. I got the 3rd star and "I've learned of beasts" line at 83 silver knight kills and again earned 3rd star, along with the "I've learned of beasts" line, at 96 golden knight kills.

Edit: I never did manage to lower the golden knights strength with the Dragon's Roost shield despite hundreds of attempts using shield storm/cymbal onslaught (nor by perfect blocking), but I did lower the silver knight's strength numerous times. It's possible my pawn witnessed it elsewhere during a rental but highly  doubtful considering I was at 96 kills before 3rd star triggered - meaning she would've had to have witnessed it in only 4 kills.