I have an idea, what if Ragnarok Online 2 have Weapon Skill scroll.
It is a scroll that can teach players a unique weapon skill.
for example, A skill that deals multiple weapon attack. Damage of each attack will be depending on the type of the weapon skill scroll, if its for STR type, the damage will depend on the STR of player and if INT type, it will depend on the INT of the player(same for WIS,AGI,VIT).
Also this weaponskill will not only for attacking, this can be a buffs type weapon skill(supportive skills).
Unique weapon skill scroll can be drop by any monster but with drop rate same as the rare items in-game.
How to use:
When you have Unique weapon skill scroll, just right click the scroll and there you have it. but you still need skill points to have this skill.
So you need to buy Reset skill points to have this skill. (FMCG )
Hope you find this interesting