It works on all classes, no matter if you are Healer/Fighter/Ranger...
1. Let say that you want to be Nefarious Rogue and you put five skill points on piercing weapons (which is Title-granted skill for Nefarious Rogue).
2. Change axiom, let say Druidic, and you get one point in Divination AND your piercing weapon lowers to four. Put one point in pearcing weapon so that it is five again.
3. Change axiom back to Nefarious and you have six points in Piercing weapons. One small skill point to Rogue, but one big blow to rats

I know, it is small thing but...
