[Active] Elsword puts himself in a state of Super Armor, which will negate him from flinching or being knocked-down for a certain period.

Requirements

Skill Information

Name: Mind & Body Technique(NA) / Law of strained breathing and strengthening(KR)

Description: Cooldown Duration is decreased by 5 seconds, and your damage increases by 10% during the buff.

Very helpful skill both in PVP and PVE, allowing for effective counterattacks, absorbing the damage of strong attacks or skills (in particular homed ones such as Magic Projectile and Guide Arrow for almost no loss, as well as for rescuing party members.
PArticularly useful when paired with Armageddon Blade.
Elsword will have a red outline while the skill is active, similar to mobs with Super Armor status.
Elsword can still be affected by the stun status while the skill is active.
There are a couple of frames left between the activating and the effect of the skill where you can still hit Elsword, canceling the skill(though the red aura may persist due to lag, or some other reason).
If desired, you can permanently make "Stoic" lv.9, in PVP, by first mastering it (lv.5), then equipping its skill ring, the Sudden Attack shirt (Elsword), 4 pieces of a Lv. 60 PVP equipment (necessarily the pants, shoes, gloves and weapon) and lastly the PVP Title "Self-Destructive Acceleration". **A recent patch in KR replaced said PVP equipment with another one, so they can't be acquired anymore, although those that had them will still keep them.