Helm of Shadow Melding

Armor Leather Helm

Item Details

Utility 17.67
Bonus Level 11
Dyeable Yes
Sellable Yes
Tradeable Yes
Armor Info
Armor Factor 42
Base Quality 90%

Restrictions

Level Required Any
Usable By
All Classes

Magical Bonuses

Basic
Dexterity 4
Stealth 3

Raw Item JSON

{
  "sell_value" : 6185,
  "type_data" : {
    "absorption" : 10,
    "base_quality" : 90,
    "clamped_armor_factor" : 42,
    "armor_factor" : 42
  },
  "sources" : {
    "monsters" : {
      "normal_drop" : [ "mist sheerie", "Driss", "mountain mephit", "spraggonale", "rock sheerie", "Rolling Stone", "rock guardian", "gray spectre", "ghoulie", "vindictive bocan", "fog phantom", "cluricaun", "siog piller", "phantom wickerman", "Withe", "grizzled badger", "river beetle", "river beetle collector", "dew sheerie", "feckless lucragan elder", "rat boy", "large eirebug warrior", "tiny eirebug", "extra large eirebug", "deamhan creig", "Crag", "ancient bodachan sabhaill", "enchanted spraggonoll", "spraggoncle", "spraggonet", "rock sheerie wanderer", "stone sheerie", "sheevra swordsman", "sheevra archer", "sheevra miner", "sheevra chieftain", "Chieftain Dergal", "Sheevra Slave Master", "feccan rogue", "luricaduane", "enchanted luricaduane", "cluricaun prankster" ]
    }
  },
  "bonus_level" : 11,
  "flags" : {
    "dyable" : true,
    "emblemizable" : false
  },
  "icon" : 440,
  "utility" : 17.666666666666668,
  "delve_text" : "Realm: Hibernia\n \nMagical Bonuses:\n- Stealth: 3 pts\n- Dexterity: 4 pts\n \n \nArmor Modifiers:\n- 42 Base Factor\n- 10% Absorption\n- 90% Quality / 100% Condition\n \n- Effective Armor:  42 Factor\n \n \nBonus Level: 11\n",
  "slot" : 1,
  "salvage_amount" : 28,
  "artifact" : false,
  "material" : 21,
  "name" : "Helm of Shadow Melding",
  "usable_by" : [ 0 ],
  "realm" : 3,
  "dye_type" : 0,
  "id" : 10855,
  "category" : 2,
  "bonuses" : [ {
    "id" : 19,
    "type" : 2,
    "value" : 3
  }, {
    "id" : 1,
    "type" : 1,
    "value" : 4
  } ],
  "ability_tags" : [ ]
}
How is utility calculated?