Here is a Swordsman Skills Classification in Ragnarok Online:
Bash
Pre-requisites: None
Active or Passive?: Active
SP Use: 8 SP up until level 5, 15 SP from 6 up
Level 1 : 130% Damage, +5 HIT
Level 2 : 160% Damage, +10 HIT
Level 3 : 190% Damage, +15 HIT
Level 4 : 220% Damage, +20 HIT
Level 5 : 250% Damage, +25 HIT
Level 6 : 280% Damage, +30 HIT
Level 7 : 310% Damage, +35 HIT
Level 8 : 340% Damage, +40 HIT
Level 9 : 370% Damage, +45 HIT
Level 10: 400% Damage, +50 HIT
Comments: It is a very good skill(RO Zeny) with no bash, you cannot kill enermies.
Magnum Break
Pre-requisites: Level 5 Bash
Active or Passive?: Active
SP Use: 15 SP
Level 1 : 20 Hp used, 115% Damage
Level 2 : 20 Hp used, 130% Damage
Level 3 : 19 Hp used, 145% Damage
Level 4 : 19 Hp used, 160% Damage
Level 5 : 18 Hp used, 175% Damage
Level 6 : 18 Hp used, 190% Damage
Level 7 : 17 Hp used, 205% Damage
Level 8 : 17 Hp used, 220% Damage
Level 9 : 16 Hp used, 235% Damage
Level 10: 16 Hp used, 250% Damage
Comments: Magnum Break has the fire attribute, so against some enemies it will hurt more, while others less. It can also be capable to push enemies back, therefore it is handy when getting mobbed. You could try to use it to kill wisper. That is the content, hope it could help you more or less.