Nimh's curse

Jewelry Jewel

Item Details

Utility 22
Bonus Level 14
Dyeable No
Sellable No
Tradeable Yes

Restrictions

Level Required Any
Usable By
All Classes

Magical Bonuses

Basic
Dexterity 7
Piety -10
Cold Resist 6%
Energy Resist 6%

Raw Item JSON

{
  "bonus_level" : 14,
  "sources" : {
    "monsters" : {
      "one_time_drop" : [ "Nimh" ]
    }
  },
  "flags" : {
    "dyable" : false,
    "emblemizable" : false,
    "no_sell" : true
  },
  "icon" : 113,
  "utility" : 22.0,
  "delve_text" : "Realm: Midgard\n \nMagical Bonuses:\n- Piety: -10 pts\n- Cold: 6%\n- Energy: 6%\n- Dexterity: 7 pts\n \n \nCannot be sold to merchants.\n \nBonus Level: 14\n",
  "slot" : 4,
  "artifact" : false,
  "material" : 0,
  "name" : "Nimh's curse",
  "usable_by" : [ 0 ],
  "realm" : 2,
  "id" : 2370,
  "category" : 5,
  "bonuses" : [ {
    "id" : 5,
    "type" : 1,
    "value" : -10
  }, {
    "id" : 12,
    "type" : 5,
    "value" : 6
  }, {
    "id" : 22,
    "type" : 5,
    "value" : 6
  }, {
    "id" : 1,
    "type" : 1,
    "value" : 7
  } ],
  "ability_tags" : [ ]
}
How is utility calculated?