Unmarshaling nest JSON response into nested struct

Here's the sample JSON returning from the web API I'm invoking:

{
    "Ability1": "Noxious Fumes",
    "AbilityId1": 7812,
    "AttackSpeed": 0.86,
    "Cons": "",
    "HP5PerLevel": 0.47,
    "Health": 360,
    "Speed": 350,
    "abilityDescription1": {
      "itemDescription": {
        "cooldown": "12s",
        "cost": "60/70/80/90/100",
        "description": "Agni summons a cloud of noxious fumes at his ground target location, doing damage every second. Firing any of Agni's abilities into the fumes detonates the gas, stunning all enemies in the radius.",
        "menuitems": [
          {
            "description": "Ability:",
            "value": "Ground Target"
          },
          {
            "description": "Affects:",
            "value": "Enemy"
          },
          {
            "description": "Damage:",
            "value": "Magical"
          },
          {
            "description": "Radius:",
            "value": "20"
          }
        ],
        "rankitems": [
          {
            "description": "Damage per Tick:",
            "value": "10/20/30/40/50 (+5% of your magical power)"
          },
          {
            "description": "Fumes Duration:",
            "value": "10s"
          },
          {
            "description": "Stun Duration:",
            "value": "1s"
          }
        ],
        "secondaryDescription": ""
      }
    },
    "abilityDescription5": {
      "itemDescription": {
        "cooldown": "",
        "cost": "",
        "description": "After hitting with 4 basic attacks, Agni will gain a buff. On the next cast of Flame Wave or Rain Fire, all enemies hit by those abilities will be additionally set ablaze, taking damage every .5s for 3s.",
        "menuitems": [
          {
            "description": "Affects:",
            "value": "Enemy"
          },
          {
            "description": "Damage:",
            "value": "Magical"
          }
        ],
        "rankitems": [
          {
            "description": "Damage per Tick:",
            "value": "5 (+10% of your magical power)"
          }
        ],
        "secondaryDescription": ""
      }
    },
    "basicAttack": {
      "itemDescription": {
        "cooldown": "",
        "cost": "",
        "description": "",
        "menuitems": [
          {
            "description": "Damage:",
            "value": "34 + 1.5/Lvl (+20% of Magical Power)"
          },
          {
            "description": "Progression:",
            "value": "None"
          }
        ],
        "rankitems": [],
        "secondaryDescription": ""
      }
    },
    "id": 1737,
    "ret_msg": null
  }

And my struct:

type God struct {
	Ability1                      string
	Ability2                      string
	Ability3                      string
	Ability4                      string
	Ability5                      string
	AbilityId1                    int
	AbilityId2                    int
	AbilityId3                    int
	AbilityId4                    int
	AbilityId5                    int
	Attack_speed                  float64
	Attack_speed_per_level        float64
	Cons                          string
	Hp5_per_level                 float64
	Health                        int
	Health_per_five               int
	Health_per_level              int
	Item1                         string
	Item2                         string
	Item3                         string
	Item4                         string
	Item5                         string
	Item6                         string
	Item7                         string
	Item8                         string
	Item9                         string
	ItemId1                       int
	ItemId2                       int
	ItemId3                       int
	ItemId4                       int
	ItemId5                       int
	ItemId6                       int
	ItemId7                       int
	ItemId8                       int
	ItemId9                       int
	Lore                          string
	Mp5_per_level                 float64
	Magic_protection              int
	Magic_protection_per_level    int
	Mana                          int
	Mana_per_five                 float64
	Mana_per_level                int
	Name                          string
	On_free_rotation              string
	Pantheon                      string
	Physical_power                int
	Physical_power_per_level      int
	Physical_protection           int
	Physical_protection_per_level float64
	Pros                          string
	Roles                         string
	Speed                         int
	Title                         string
	Type                          string
	Abilitydescription1           struct {
		Item_description struct {
			Cooldown    string
			Cost        string
			Description string
			Menu_items  struct {
				Description string
				Value       string
			}
			Rank_items struct {
				Description string
				Value       string
			}
			Secondary_description string
		}
	}
	Ability_description2 struct {
		Item_description struct {
			Cooldown    string
			Cost        string
			Description string
			Menu_items  struct {
				Description string
				Value       string
			}
			Rank_items struct {
				Description string
				Value       string
			}
			Secondary_description string
		}
	}
	Ability_description3 struct {
		Item_description struct {
			Cooldown    string
			Cost        string
			Description string
			Menu_items  struct {
				Description string
				Value       string
			}
			Rank_items struct {
				Description string
				Value       string
			}
			Secondary_description string
		}
	}
	Ability_description4 struct {
		Item_description struct {
			Cooldown    string
			Cost        string
			Description string
			Menu_items  struct {
				Description string
				Value       string
			}
			Rank_items struct {
				Description string
				Value       string
			}
			Secondary_description string
		}
	}
	Ability_description5 struct {
		Item_description struct {
			Cooldown    string
			Cost        string
			Description string
			Menu_items  struct {
				Description string
				Value       string
			}
			Rank_items struct {
				Description string
				Value       string
			}
			Secondary_description string
		}
	}
	Basic_attack struct {
		Item_description struct {
			cooldown    string
			cost        string
			description string
			Menu_items  struct {
				Description string
				Value       string
			}
			Rank_items struct {
				Description string
				Value       string
			}
			Secondary_description string
		}
	}
	Id      int
	Ret_msg string
}

Here's how I unmarshal the JSON response into the struct array:

var gods []God
json.Unmarshal(jsonResponse, &gods)
return gods

Everything is marshalling properly except the abilityDescription1(2,3,4,5) and everything within that struct.

Any suggestions?

Use struct tags to map JSON field names to struct field names.

Many of your struct fields are lowercase and therefore unexported, which means the encoding/json package cannot access/marshal into them. Take a look at http://golang.org/pkg/reflect/#StructTag (the JSON package will match "Description" with "description", though - i.e. lower-case is already a match)

You are also better off (for readability/ability to add tags) splitting your structs into separate items, and then embedding them. You have cases where you're repeating Rank_items, whereas you could define it once and then embed it as needed:

e.g.

   Basic_attack struct {
        ItemDescription ItemDesc `json:"itemDescription"`
        Menu []MenuItems `json:"menuitems"`
        Rank []RankItems  `json:"rankitems"`
   }

   ItemDesc struct {
        Cooldown    string `json:"cooldown"`
        Cost        string `json:"cost"`
        Description string `json:"description"`
        Menu        []MenuItems `json:"menuitems"`
        ...
   }

   MenuItems  struct {
            Description string 
            Value       string
  }

   RankItems struct {
                Description string
                Value       string
   }