Bracelet of Necromantic Illusions

Jewelry Bracer

Item Details

Utility 12
Bonus Level 11
Dyeable No
Sellable Yes
Tradeable Yes

Restrictions

Level Required 18
Usable By
All Classes

Magical Bonuses

Basic
Hit Points 24
Strength 9
Catacombs
Defensive Bonus (PvE) 3

Primary Ability

Armor Factor Buff Level 18
Charge (10 max)


Raw Item JSON

{
  "sell_value" : 3710,
  "requirements" : {
    "level_required" : 18
  },
  "bonus_level" : 11,
  "sources" : {
    "monsters" : {
      "normal_drop" : [ "Cynthia the Necromancer" ]
    }
  },
  "flags" : {
    "dyable" : false,
    "emblemizable" : false
  },
  "icon" : 619,
  "utility" : 12.0,
  "delve_text" : " \nMagical Bonuses:\n- Hits: 24 pts\n- Strength: 9 pts\n- Defensive Bonus: 3% (PvE Only)\n \nLevel Requirement: 18 Level\n \n \nCharged Magic Ability:\n- 10 Charges\n- 10 Max\nFunction: shield\n \nAdds to the recipient's Armor Factor (AF), resulting in better protection against some forms of attack. It acts in addition to any armor the target is wearing.\n \nValue: 35\nTarget: Self\nDuration: 10:00 min\nCasting time: instant\n \n- This spell is cast when the item is used.\n \nCan use item every: 1:30 min\n \n \nBonus Level: 11\n",
  "slot" : 13,
  "abilities" : [ {
    "max_charges" : 10,
    "spell" : 10167,
    "magic_type" : 6,
    "power_level" : 18,
    "position" : 1
  } ],
  "artifact" : false,
  "material" : 0,
  "name" : "Bracelet of Necromantic Illusions",
  "usable_by" : [ 0 ],
  "realm" : 0,
  "id" : 49291,
  "category" : 5,
  "use_duration" : 90,
  "bonuses" : [ {
    "type" : 4,
    "value" : 24
  }, {
    "id" : 0,
    "type" : 1,
    "value" : 9
  }, {
    "type" : 49,
    "value" : 3
  } ],
  "ability_tags" : [ "fn_shield" ]
}
How is utility calculated?