Now, I'm new to Ars Magica 2, so it is possible I'm missing something and doing something wrong. But as far as I can tell, I'm just suppose to shoot dark mages (light mages don't work) with a disarm projectile. My disarm projectile is definitely a disarm projectile, it disarms everything else. But for some reason, I can't get an affinity tome from dark mages. Is it a random chance? I've only tried three so far. One, it seemed, dropped a witchwood sapling when I disarmed it? The other two dropped nothing. Any ideas? Thanks!