Earth Forged Cloak of Concentration

Jewelry Cloak

Item Details

Utility 13
Bonus Level 11
Dyeable Yes
Sellable Yes
Tradeable Yes

Restrictions

Level Required Any
Usable By
All Classes

Magical Bonuses

Basic
Hit Points 20
Acuity 12
Catacombs
Concentration 4

Raw Item JSON

{
  "sell_value" : 3710,
  "sources" : {
    "monsters" : {
      "normal_drop" : [ "Forgemaster Zybnarak" ]
    }
  },
  "bonus_level" : 11,
  "flags" : {
    "dyable" : true,
    "emblemizable" : true
  },
  "icon" : 558,
  "utility" : 13.0,
  "delve_text" : " \nMagical Bonuses:\n- Concentration: 4%\n- Requirement: Cannot be used in the Frontiers\n- Acuity: 12 pts\n- Hits: 20 pts\n \n \n \nBonus Level: 11\n",
  "slot" : 6,
  "artifact" : false,
  "material" : 0,
  "name" : "Earth Forged Cloak of Concentration",
  "usable_by" : [ 0 ],
  "realm" : 0,
  "dye_type" : 0,
  "id" : 25614,
  "category" : 5,
  "bonuses" : [ {
    "type" : 38,
    "value" : 4,
    "requirement_id" : 6207
  }, {
    "id" : 10,
    "type" : 1,
    "value" : 12
  }, {
    "type" : 4,
    "value" : 20
  } ],
  "ability_tags" : [ ]
}
How is utility calculated?