Hunting Bow of Kator

Weapon Bow Two Handed

Item Details

Utility 57.33
Bonus Level 10
Dyeable No
Sellable Yes
Tradeable Yes
Damage Info
DPS 14.4
Speed 4.2
Base Quality 98%

Restrictions

Level Required Any
Usable By
All Classes

Magical Bonuses

Basic
Dexterity 13
Quickness 13
ToA
Arcane Siphon 8%

Raw Item JSON

{
  "sell_value" : 26291,
  "type_data" : {
    "damage_type" : 3,
    "left_handed" : 0,
    "dps" : 14.4,
    "base_quality" : 98,
    "range" : 1200,
    "two_handed" : 1,
    "skill_used" : 4,
    "clamped_dps" : 14.4,
    "speed" : 4.2
  },
  "bonus_level" : 10,
  "sources" : {
    "monsters" : {
      "normal_drop" : [ "Overlord Kator" ]
    }
  },
  "flags" : {
    "dyable" : false,
    "emblemizable" : false
  },
  "icon" : 471,
  "utility" : 57.33333333333333,
  "delve_text" : "Realm: Hibernia\n \nMagical Bonuses:\n- Dexterity: 13 pts\n- Quickness: 13 pts\n \nArcane Siphon: 8% chance to cast a spell or fire a bow without expending energy.\n \nDamage Modifiers:\n- 14.4 Base DPS\n- 4.2 Weapon Speed\n- 98% Quality / 70% Condition\n- Damage Type: Thrust\n- Base Range: 1200\n \n- Effective Damage: 9.9 DPS\n \n \nBonus Level: 10\n",
  "salvage_amount" : 12,
  "artifact" : false,
  "material" : 39,
  "name" : "Hunting Bow of Kator",
  "usable_by" : [ 0 ],
  "realm" : 3,
  "id" : 49177,
  "category" : 1,
  "bonuses" : [ {
    "id" : 1,
    "type" : 35,
    "value" : 8
  }, {
    "id" : 1,
    "type" : 1,
    "value" : 13
  }, {
    "id" : 3,
    "type" : 1,
    "value" : 13
  } ],
  "ability_tags" : [ ]
}
How is utility calculated?