If you use this skill, your HIT and damage will receive a huge increase, but all your defense based upon equipment and stats will decrease.
This skill also gives the Endure effect upon cast without further SP cost and will reset the 7-Hit counter if the Endure effect was already active.
Also, the 10 sec recast Endure timer will be reset, but only if the original effect came from the Swordman Endure Skill (yes, basically you can recast Endure within
the 10 sec with this, but only ONCE, since Concentration-Endure does NOT reset its own Endure timer). Contrary to the IRO name, it can be used with every weapon.

When active, this skill endows the caster with the Endure effect and increased ATK and HIT, but will also temporarily reduces caster's Defense.