Charge Dash, leave at level 1, it's not worth leveling(aika online gold) more than that, since the distance and time increases minimally, and the damage is terrible. Charge dash is basically a 10m stride with the warrior that stuns enemies with some additional damage.
While leveling it gives you more range and damage in Aika, both are too little of a trade off compared to skill point usage. Armor Break, this is one of your greatest skills at 1 to 27. Low cool down, heavy damage, and you can cut into your enemy's defense. This one you train high.
Armor break impacts heavy damage, for a set time reduces enemy defenses, good for PvE and PvP. However in nation war PvP, this skill is reserved when the field is smaller, and there are just a few stronger heads left.
However, once you break out of 27, Armor Break then becomes questionable. It's CD is 12 seconds, can break some 300+ defense at max, and still maintains fairly well damage for low MP cost. It's all up to your preferences.