Maplestory "High Five" Private Showcase

Why is your Gungnir Descent on three different slots? I though you would use one skill on a single slot. Whats the difference?

I have gungnir on 4 different core slots. Its only on one of the cores it can be the very first placed skill. Having a skill on different core slots really helps progressing the skill's level speed because if i were to only have one of the gungnir, impale, and hyper cores, they would all only be level 13.

basically the system adds up the ranks of all the cores that gungnir is on and it gives me the level of the skill. (13 + 13 + 12 + 12 = 50)