The assassins target the mystic towers straight away when the wave starts, i cant draw aggro until the mystic towers are destroyed.
The moment there arent any players alive they target the other towers.
There are some targeting issues with the assassins. But they should still prioritize players over anything else. The bug is that they do not re-target players if they start attacking a tower.
They completely wreck my towers that are attackable. In my experience they demolish squire blockades and apprentice Frostbite Towers, but I have not tested other towers.
Extremely irritating bug.
they also can attack the Core, as well as cleave from towers onto the Core! LOL
Issue resolved in next release.