Wait for the Dragons to stop attacking and kill them with Power Bombs It can be faster to control Samus so the Power Bomb does not bounce her, or to avoid Dragon projectiles while Power Bombing them. Dragons must be on screen to take damage.

Requires:

"h_canNavigateHeatRooms"
"Morph"
{
  "enemyKill": {
    "enemies": [
      [
        "Dragon"
      ]
    ],
    "explicitWeapons": [
      "PowerBombPeriphery"
    ]
  }
}
{
  "enemyKill": {
    "enemies": [
      [
        "Dragon",
        "Dragon"
      ]
    ],
    "explicitWeapons": [
      "PowerBomb"
    ]
  }
}
{
  "heatFrames": 2200
}