[
  {
    "id": "ancient_sentinel",
    "race": "ancient",
    "tier": 1,
    "cost_minerals": 120,
    "cost_gas": 0,
    "hp": 500,
    "armor_type": 2,
    "attack_type": 1,
    "damage": 30,
    "attack_speed": 0.4,
    "range": 3.5,
    "move_speed": 80.0,
    "upgrades_to": "ancient_colossus",
    "strong_vs_waves": [4, 7, 10]
  },
  {
    "id": "ancient_colossus",
    "race": "ancient",
    "tier": 2,
    "cost_minerals": 250,
    "cost_gas": 60,
    "hp": 1000,
    "armor_type": 2,
    "attack_type": 1,
    "damage": 75,
    "attack_speed": 0.35,
    "range": 4.5,
    "move_speed": 70.0,
    "upgrades_to": "ancient_titan",
    "strong_vs_waves": [13, 17, 20, 22]
  },
  {
    "id": "ancient_titan",
    "race": "ancient",
    "tier": 3,
    "cost_minerals": 500,
    "cost_gas": 150,
    "hp": 2200,
    "armor_type": 2,
    "attack_type": 3,
    "damage": 200,
    "attack_speed": 0.3,
    "range": 5.5,
    "move_speed": 60.0,
    "upgrades_to": "",
    "strong_vs_waves": [25, 27, 29, 30, 31]
  }
]