Bonedancer's Enhancement Gem

Jewelry Jewel

Item Details

Utility 50
Bonus Level 25
Dyeable No
Sellable Yes
Tradeable Yes

Restrictions

Level Required 50
Usable By
Bonedancer

Magical Bonuses

Basic
Darkness 3
Suppression 3
Bone Army 4

Primary Ability

Damage Shield Level 50
Charge (30 max)


Raw Item JSON

{
  "sell_value" : 37718,
  "requirements" : {
    "usable_by" : [ 30 ],
    "level_required" : 50
  },
  "bonus_level" : 25,
  "sources" : {
    "monsters" : {
      "normal_drop" : [ "glopsk grattasvamp" ]
    }
  },
  "flags" : {
    "dyable" : false,
    "emblemizable" : false
  },
  "icon" : 114,
  "utility" : 50.0,
  "delve_text" : " \nUsable By: \n- Bonedancer\n \nMagical Bonuses:\n- Bone Army: 4 pts\n- Darkness: 3 pts\n- Suppression: 3 pts\n \nLevel Requirement: 50 Level\n \n \nCharged Magic Ability:\n- 30 Charges\n- 30 Max\nFunction: damage shield\nDamage: 5.1\nTarget: Self\nDuration: 20 sec\nPower cost: 33\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: 25\n",
  "slot" : 4,
  "abilities" : [ {
    "max_charges" : 30,
    "spell" : 3783,
    "magic_type" : 6,
    "power_level" : 50,
    "position" : 1
  } ],
  "artifact" : false,
  "material" : 0,
  "name" : "Bonedancer's Enhancement Gem",
  "usable_by" : [ 30 ],
  "realm" : 0,
  "id" : 23191,
  "category" : 5,
  "use_duration" : 90,
  "bonuses" : [ {
    "id" : 126,
    "type" : 2,
    "value" : 4
  }, {
    "id" : 38,
    "type" : 2,
    "value" : 3
  }, {
    "id" : 39,
    "type" : 2,
    "value" : 3
  } ],
  "ability_tags" : [ "fn_dmg_shield" ]
}
How is utility calculated?