Grubthor's Gem of Parrying

Jewelry Jewel

Item Details

Utility 53
Bonus Level 29
Dyeable No
Sellable Yes
Tradeable Yes

Restrictions

Level Required 50
Usable By
All Classes

Magical Bonuses

Basic
Strength 15
Hit Points 32
Dexterity 15
Parry 3
Cold Resist 5%
Catacombs
Parry (PvE) 4

Primary Ability

Health Regen Level 50
Charge (30 max)


Raw Item JSON

{
  "sell_value" : 37119,
  "requirements" : {
    "level_required" : 50
  },
  "bonus_level" : 29,
  "sources" : {
    "monsters" : {
      "normal_drop" : [ "Grubthor" ]
    }
  },
  "flags" : {
    "dyable" : false,
    "emblemizable" : false
  },
  "icon" : 114,
  "utility" : 53.0,
  "delve_text" : " \nMagical Bonuses:\n- Parry: 3 pts\n- Strength: 15 pts\n- Dexterity: 15 pts\n- Cold: 5%\n- Hits: 32 pts\n- Parry: 4% (PvE Only)\n \nLevel Requirement: 50 Level\n \n \nCharged Magic Ability:\n- 30 Charges\n- 30 Max\nFunction: health regen\n \nTarget regenerates health during the duration of the spell.\n \nValue: 52\nTarget: Self\nDuration: 20 sec\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: 29\n",
  "slot" : 4,
  "abilities" : [ {
    "max_charges" : 30,
    "spell" : 3786,
    "magic_type" : 6,
    "power_level" : 50,
    "position" : 1
  } ],
  "artifact" : false,
  "material" : 0,
  "name" : "Grubthor's Gem of Parrying",
  "usable_by" : [ 0 ],
  "realm" : 0,
  "id" : 47967,
  "category" : 5,
  "use_duration" : 90,
  "bonuses" : [ {
    "id" : 8,
    "type" : 2,
    "value" : 3
  }, {
    "id" : 0,
    "type" : 1,
    "value" : 15
  }, {
    "id" : 1,
    "type" : 1,
    "value" : 15
  }, {
    "id" : 12,
    "type" : 5,
    "value" : 5
  }, {
    "type" : 4,
    "value" : 32
  }, {
    "type" : 51,
    "value" : 4
  } ],
  "ability_tags" : [ "fn_enhancement_health_regen" ]
}
How is utility calculated?