Extend your spear, and spin it in a spiral fashion to increase overall damage and ability to pierce. A more powerful version of Pierce which ignores DEF and VIT DEF and also stun-locks your opponent for 3 sec.
Damage is (100+50*SkillLV)% ATK. The attack is 5 hits with the damage divided evenly between the hits. However you can increase damage further by increasing the weight of your weapon (upgrades count too! LV 1 weapons +10/upgrade, LV 2 weapons +15/upgrade, LV 3 weapons +25/upgrade).
Although damage will increase with better skill level, so will the Cast Time / Cool Down. Aura Blade does not add damage to this skill. Recent tests revealed the following (rather complex) formula:
[(80% of weapons weight times (100%+level*50%) + (round.down(STR/10^2) + Upgrade Damage) * size modifier (small 125%, medium 100%, large 75%)) * card factors (+20% and such) * element factors ]* 5 hits

Hit an enemy with spiraling strikes that immobilize it for a second and inflict an amount of damage determined by the skill's level and the weight of the equipped weapon.

This skill's level also affects its cast time and delay.