[
  {
    "id": "ghost_rifleman",
    "race": "ghost",
    "tier": 1,
    "cost_minerals": 75,
    "cost_gas": 0,
    "hp": 120,
    "armor_type": 0,
    "attack_type": 1,
    "damage": 18,
    "attack_speed": 1.2,
    "range": 4.5,
    "move_speed": 200.0,
    "upgrades_to": "ghost_sniper",
    "strong_vs_waves": [1, 2, 3, 6]
  },
  {
    "id": "ghost_sniper",
    "race": "ghost",
    "tier": 2,
    "cost_minerals": 150,
    "cost_gas": 25,
    "hp": 180,
    "armor_type": 0,
    "attack_type": 1,
    "damage": 42,
    "attack_speed": 0.7,
    "range": 7.0,
    "move_speed": 190.0,
    "upgrades_to": "ghost_phantom_operative",
    "strong_vs_waves": [4, 7, 10, 13]
  },
  {
    "id": "ghost_phantom_operative",
    "race": "ghost",
    "tier": 3,
    "cost_minerals": 300,
    "cost_gas": 75,
    "hp": 250,
    "armor_type": 0,
    "attack_type": 2,
    "damage": 90,
    "attack_speed": 0.8,
    "range": 8.0,
    "move_speed": 210.0,
    "upgrades_to": "",
    "strong_vs_waves": [20, 25, 28, 31]
  },
  {
    "id": "ghost_medic",
    "race": "ghost",
    "tier": 1,
    "cost_minerals": 80,
    "cost_gas": 0,
    "hp": 150,
    "armor_type": 0,
    "attack_type": 0,
    "damage": 8,
    "attack_speed": 1.5,
    "range": 3.0,
    "move_speed": 180.0,
    "upgrades_to": "ghost_field_surgeon",
    "strong_vs_waves": [1, 2, 5, 8]
  },
  {
    "id": "ghost_field_surgeon",
    "race": "ghost",
    "tier": 2,
    "cost_minerals": 175,
    "cost_gas": 30,
    "hp": 200,
    "armor_type": 0,
    "attack_type": 0,
    "damage": 20,
    "attack_speed": 1.2,
    "range": 4.0,
    "move_speed": 175.0,
    "upgrades_to": "",
    "strong_vs_waves": [9, 11, 14, 18]
  }
]