When using a Skill Training Crystal item, the required hits with a tier 1~3 skill to gain 1 skill percent is reduced.
There are 3 types of Skill Training Crystal, Red , Cyan and Purple
Skill Training Crystal can be collected by kiling monsters all maps

Image	Name	Duration	Training Speed
	Red Skill Crystal	30 minutes	*2
	Cyan Skill Crystal	60 minutes	*4
	Purple Skill Crystal	1 time use	Make all skills 100%