Between 11th November (11 AM) and 14th November (11 AM CET), you get a +50% chance (on normal servers) and a +150% chance on NosVersary to reach the higher levels when acquiring specialist partner skills!
Whenever you acquire a specialist partner skill, you can get one of any level, high or low. The levels are divided from highest to lowest into S, A, B, C, D, E and F. While this action cannot fail, you obviously want to get the best possible skill you can. This event gives you a greater chance of getting skills of levels S, A and B!
Have fun,
The NosTale Team