Drum of Fading Valor

Instrument

Item Details

Utility 30
Bonus Level 14
Dyeable No
Sellable Yes
Tradeable Yes

Restrictions

Level Required Any
Usable By
All Classes

Magical Bonuses

Basic
Hit Points 24
Cold Resist 4%
Spirit Resist 4%
Energy Resist 4%

Raw Item JSON

{
  "sell_value" : 31491,
  "bonus_level" : 14,
  "sources" : {
    "stores" : [ "Albion Tester Weapons, lvl 46" ]
  },
  "flags" : {
    "dyable" : false,
    "emblemizable" : false
  },
  "icon" : 2977,
  "utility" : 30.0,
  "delve_text" : "Realm: Albion\n \nMagical Bonuses:\n- Hits: 24 pts\n- Cold: 4%\n- Energy: 4%\n- Spirit: 4%\n \n \n \nBonus Level: 14\n",
  "salvage_amount" : 9,
  "artifact" : false,
  "material" : 69,
  "name" : "Drum of Fading Valor",
  "usable_by" : [ 0 ],
  "realm" : 1,
  "id" : 11112,
  "category" : 4,
  "bonuses" : [ {
    "type" : 4,
    "value" : 24
  }, {
    "id" : 12,
    "type" : 5,
    "value" : 4
  }, {
    "id" : 22,
    "type" : 5,
    "value" : 4
  }, {
    "id" : 17,
    "type" : 5,
    "value" : 4
  } ],
  "ability_tags" : [ ]
}
How is utility calculated?