* ThatOneAttack: the Serperior's Leaf Blade (see below).
* ThatOneBoss: the Serperior. That's right, the very first boss. The reason for that is because his razor leaf projectiles stick on screen for a long time, so it is all too possible to run into them trying to avoid his other attack. Better spend the note you get from the level before him to get an attack that [[ElementalRockPaperScissors exploits his weaknesses]] (Serperior is Grass, so get Fire or Poison).
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