Combo Number 5 is a Quest you can get once you have unlocked Magma Crater. It unlocks at level 19.

Magma Crater is the most dangerous place on this island. To help you out, I am willing to teach you the Combo skill. However, you must prove to me that you can handle it by defeating 15 Skeletons.
Kill 15 Skeleton
Combo (Attack), 100 Experience

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