More skill update(Daggers) based off of Treasure Hunter forum

*Skill 'Dash' cool time reduced to around 1 min.

*'Dash' duration time increased to 15 seconds

*Deadly Blow/Back Stab enchanced with 'Instant Kill' effect

*'Instant Kill' effect probability increased

*Critical Blow(General description, look at Jihae's post.)
Total of 10 skill levels, level 10 Power = 3613. Effect 1 to 5, Duration 15sec.

*Stealth is not a toggle skill like silent walk. Duration = 2minutes, able to use it right away again(Cool time <2min), P. Atk, P. Def, M. Def, Accuracy and Critical chance greatly decreased during stealth. No movement speed deduction.

*'Lethal Blow' Cooltime reduced

*'Bluff' Mp cost reduced to 35

*'Focus Power/Chance' Mp cost reduced to 35

*'Vicious Stance' adds a bit more critical damage to stab skills.

*Test Server Bug?: There's a chance of 'Instant Kill' even if the stabbing doesn't land on the character.