Drum of Ogre Discipline

Instrument

Item Details

Utility 52.33
Bonus Level 28
Dyeable No
Sellable Yes
Tradeable Yes

Restrictions

Level Required 49
Usable By
All Classes

Magical Bonuses

Basic
Quickness 16
Charisma 16
Spirit Resist 8%
Instruments 3

Primary Ability

Armor Factor Buff Level 49
Charge (30 max)


Raw Item JSON

{
  "sell_value" : 37719,
  "requirements" : {
    "level_required" : 49
  },
  "bonus_level" : 28,
  "sources" : {
    "monsters" : {
      "normal_drop" : [ "Drihten Elreden" ]
    }
  },
  "flags" : {
    "dyable" : false,
    "emblemizable" : false
  },
  "icon" : 2977,
  "utility" : 52.33333333333333,
  "delve_text" : "Realm: Albion\n \nMagical Bonuses:\n- Instruments: 3 pts\n- Charisma: 16 pts\n- Quickness: 16 pts\n- Spirit: 8%\n \nLevel Requirement: 49 Level\n \n \nCharged Magic Ability:\n- 30 Charges\n- 30 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: 75\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: 28\n",
  "abilities" : [ {
    "max_charges" : 30,
    "spell" : 3850,
    "magic_type" : 6,
    "power_level" : 49,
    "position" : 1
  } ],
  "salvage_amount" : 5,
  "artifact" : false,
  "material" : 71,
  "name" : "Drum of Ogre Discipline",
  "usable_by" : [ 0 ],
  "realm" : 1,
  "id" : 23931,
  "category" : 4,
  "use_duration" : 90,
  "bonuses" : [ {
    "id" : 98,
    "type" : 2,
    "value" : 3
  }, {
    "id" : 7,
    "type" : 1,
    "value" : 16
  }, {
    "id" : 3,
    "type" : 1,
    "value" : 16
  }, {
    "id" : 17,
    "type" : 5,
    "value" : 8
  } ],
  "ability_tags" : [ "fn_shield" ]
}
How is utility calculated?