Day 7
bst/nin, Easy Prey Orc in Dynamis Beaucedine
Full Moon 90% - 95%

197 ninjutsu casts
8 Triggers

Trigger rate 4.1%

This one was anomalous, one of the summoners endured ~60 spells without triggering, so I eventually just killed it. I was the only person farming there, and while I had the summoner orcs in view most of the time, I can't guarantee that someone didn't come in and trigger it themselves then immediately die.