[Trigger] Making an item reduce the mana cost of the Hero's abilities

[Napoqe]

I'm trying to create an item that reduces the mana cost of all the hero's skills. But it's not working. Strangely, when I learn a hero's skill point, the mana cost of that skill changes even though I haven't created an event for it.
Can someone test this field mana cost function? And show me a solution?

Item Description: When holding this item reduces the mana cost of all hero skills by 50%.

I know I'll have to create a Trigger for when the hero learns a skill, to update the item's effect.

• Sobe Mask
  • Events
    • Unit - A unit Acquires an item
  • Conditions
    • (Item-type of (Item being manipulated)) Equal to Máscara Sobi
  • Actions
    • For each (Integer A) from 1 to 4, do (Actions)
      • Loop - Actions
        • Ability - Set Ability: (Unit: (Hero manipulating item)'s Ability with Ability Code: Hero_Abilities[(Integer A)])'s Integer Level Field: Mana Cost ('amcs') of Level: (Level of Hero_Abilities[(Integer A)] for (Hero manipulating item)) to ((For (Hero manipulating item), Mana cost of Hero_Abilities[(Integer A)], Level (Level of Hero_Abilities[(Integer A)] for (Hero manipulating item)).) / 2)
    • Ability - Set Ability: (Unit: (Hero manipulating item)'s Ability with Ability Code: Luz Sagrada )'s Integer Level Field: Mana Cost ('amcs') of Level: (Level of Luz Sagrada for (Hero manipulating item)) to ((For (Hero manipulating item), Mana cost of Luz Sagrada , Level (Level of Luz Sagrada for (Hero manipulating item)).) / 2)

• Sobe Mask off
  • Events
    • Unit - A unit Loses an item
  • Conditions
    • (Item-type of (Item being manipulated)) Equal to Máscara Sobi
  • Actions
    • For each (Integer A) from 1 to 4, do (Actions)
      • Loop - Actions
        • Ability - Set Ability: (Unit: (Hero manipulating item)'s Ability with Ability Code: Hero_Abilities[(Integer A)])'s Integer Level Field: Mana Cost ('amcs') of Level: (Level of Hero_Abilities[(Integer A)] for (Hero manipulating item)) to (Mana cost of Hero_Abilities[(Integer A)], Level (Level of Hero_Abilities[(Integer A)] for (Hero manipulating item)).)

• Hero
  • Events
    • Unit - A unit Sells a unit
  • Conditions
    • ((Sold unit) is A Hero) Equal to True
  • Actions
    • Unit - Remove Taverna 0006<gen> from the game
    • Unit - Remove Camponês (Gênero masculino) 0000<gen> from the game
    • Set VariableSet Hero = (Sold unit)
    • Hero - Set Hero Hero-level to 10, Hide level-up graphics
    • Hero - Modify unspent skill points of Hero: Subtract 3 points
    • -------- Items --------
    • Player - Set Player 1 (Red).Current gold to 1000
    • Unit - Create 1 Mercado for Neutral Passive at (Position of Taverna 0006<gen>) facing Default building facing degrees
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • (Unit-type of (Sold unit)) Equal to Dark Ranger
      • Then - Actions
        • Ability - Set Ability: (Unit: (Sold unit)'s Ability with Ability Code: Onda de Choque )'s Integer Level Field: Attacks Prevented ('Nsi1') of Level: 1 to 8
      • Else - Actions
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • (Unit-type of (Sold unit)) Equal to Paladino
      • Then - Actions
        • Set VariableSet Hero_Abilities[1] = Martelo da Justiça
        • Set VariableSet Hero_Abilities[2] = Luz Sagrada
        • Set VariableSet Hero_Abilities[3] = Retribuição
        • Set VariableSet Hero_Abilities[4] = Intervenção Divina
      • Else - Actions

 

[Chaosium]

Usually you need to "update" the abilities for change to take effect, try with increasing level of ability X immediately followed by decreasing its level