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After entering with R-mode, perform a Crystal Flash to fully refill at some point before the rainbow beam attack. An R-Mode forced stand-up will happen during the rainbow beam attack, slightly reducing the damage taken which allows surviving with one fewer tank than normal.

Requires:

"h_AllMotherBrainBarriersCleared",
{"notable": "R-Mode Reduced Tanks"},
{"obstaclesCleared": ["R-Mode"]},
"h_CrystalFlash",
{"enemyKill": {
  "enemies": [["Mother Brain 2"]]
}},
{"or": [
  {"resourceAvailable": [
    {"type": "RegularEnergy", "count": 299},
    {"type": "ReserveEnergy", "count": 300}
  ]},
  {"resourceAvailable": [
    {"type": "RegularEnergy", "count": 399},
    {"type": "ReserveEnergy", "count": 200}
  ]},
  {"resourceAvailable": [
    {"type": "RegularEnergy", "count": 499},
    {"type": "ReserveEnergy", "count": 100}
  ]}
]}

Sets flags: f_ZebesSetAblaze, f_DefeatedMotherBrain