Patent Blessed Knife

Item ID 510071 Name Patent Blessed Knife
A knife said to have been used by brave heroes in the past.
It is said that it can only be used by those who have received the angel's blessing.
An ancient power has been imbued and it has begun to show its original ability.
It seems to resonate with the Great Hero's Boots.
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For each 2 Refine Levels:
ATK +15
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For each 3 Refine Levels:
Increases damage of Back Stab by 25%.
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Refine Level +7:
Increases Physical Damage against enemies of every element by 15%.
Enables the use of Level 10 Fatal Menace.
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Refine Level +9:
Increases Attack Speed (decreases After Attack Delay by 10%).
Increases damage of Fatal Menace by 10%.
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Refine Level +11:
Decreases After Skill Delay by 5%.
Increases Melee Physical Damage by 15%.
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When equipped with Great Hero's Boots:
STR +10
Increases Melee Physical Damage by 7%.
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Type: Dagger
Attack: 210
Weight: 120
Weapon Level: 4
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Requirement:
Base Level 150
Novice
Weapon Level 4 Identifier Up_Blessed_Knife
Attack 210 Type Weapon - Dagger
MATK 0 Equip Locations Main Hand
Defense 0 Equippable Jobs Novice, Super novice
Range 1 Equip Gender Both (Male and Female)
Slots 2 Equip Upper None
Weight 120 Min Equip Level 150
NPC Buy 0 Max Equip Level None
NPC Sell 0 Refineable Yes
Credit Price None Trade restriction None
Item Script 
.@r = getrefine();
bonus bBaseAtk,15*(.@r/2);
bonus2 bSkillAtk,"RG_BACKSTAP",25*(.@r/3);
if (.@r>=7) {
   skill "SC_FATALMENACE",10;
   bonus2 bAddEle,Ele_All,15;
   if (.@r>=9) {
      bonus bAspdRate,10;
      bonus2 bSkillAtk,"SC_FATALMENACE",10;
      if (.@r>=11) {
         bonus bShortAtkRate,15;
         bonus bDelayrate,-5;
      }
   }
}

Set Script
Patent Blessed Knife
Great Hero Boots 
bonus bShortAtkRate,5;
bonus bStr,10;
Ring of Unknown Hero (Novice)
Patent Blessed Knife 
bonus2 bAddRace,RC_All,8;
if (getequiprefinerycnt(EQI_HAND_R)>=11)
   bonus2 bSkillAtk,"SC_FATALMENACE",(readparam(bStr)+readparam(bAgi))/12;
[Not For Sale] Ring of Unknown Hero (Novice)
Patent Blessed Knife 
bonus2 bAddRace,RC_All,8;
if (getequiprefinerycnt(EQI_HAND_R)>=11)
   bonus2 bSkillAtk,"SC_FATALMENACE",(readparam(bStr)+readparam(bAgi))/12;