The Hexaxe has a 100% proc on kill to grant the Player Killing Blow. Xml shows me that it has the after=1 flag but still the proc doesn't work corrctly. * It does not always appear after killing a monster * If it appears, it sometimes gets consumed even if nothing happend (a 1v1 dual with a monster)
A hint for fixing it: Make a sub-spell that the proc points to, that in turn triggers killing blow, with amount="1". (So you get it at the start of your next turn).