ok so my old character was a level 20 and it said the exact same thing. What i think means is that they might steal blades from you or destroy your shields . So i hope this helps. For some extra advice be really carefull. I think he was a student. He also has some what a lot of health. well i think.
Some bosses have cheats, they usually give you a clue to what it is or what triggers it. For instance Chester Droors casts free heals on himself if you don't place a trap on him. Many bosses throughout the spiral have various cheats, better get used to it.