Average Mythirian of Siphoning

Other Mythirian

Item Details

Utility 45
Bonus Level 50
Dyeable No
Sellable Yes
Tradeable Yes

Restrictions

Level Required Any
Usable By
All Classes

Magical Bonuses

ToA
Arcane Siphon 9%

Raw Item JSON

{
  "sell_value" : 500000,
  "requirements" : {
    "champion_level_required" : 6
  },
  "bonus_level" : 50,
  "sources" : {
    "stores" : [ "TL room scrolls & mythirians", "Norm Myth" ],
    "monsters" : {
      "normal_drop" : [ "minotaur adjudicator", "minotaur firebranded", "minotaur tiller", "minotaur deathguard", "corpse spider", "corpse", "minotaur mortician", "minotaur mauler trainee", "minotaur mauler student", "minotaur servitor", "goblin graverobber", "Spider Handler Spivey", "Deadguard Prime Mals", "Deathpriest Quietus IV", "Brownwrap Sanith", "Blackwrap Raoa", "Gardener Locum", "Digmaster Garao" ]
    }
  },
  "flags" : {
    "dyable" : false,
    "emblemizable" : false
  },
  "icon" : 3551,
  "utility" : 45.0,
  "delve_text" : " \n - Requires: Champion Level 6\n \n  (This Mythirian will give you a chance to not use energy when casting a spell or using a bow.)\nMagical Bonuses:\n \nArcane Siphon: 9% chance to cast a spell or fire a bow without expending energy.\n \n \nBonus Level: 50\n",
  "slot" : 17,
  "artifact" : false,
  "material" : 0,
  "name" : "Average Mythirian of Siphoning",
  "usable_by" : [ 0 ],
  "realm" : 0,
  "id" : 59361,
  "category" : 8,
  "bonuses" : [ {
    "id" : 1,
    "type" : 35,
    "value" : 9
  } ],
  "ability_tags" : [ ]
}
How is utility calculated?