Chimera's advantage

For the duration, when you hit a creature, the damage type changes based on the creature’s characteristics dealing an extra 2d6 demage:
• Beasts, Humanoids, or Giants: The attack deals lightning damage
• Undead, Fiends, or Aberrations: The attack deals radiant damage
• Dragons or Elementals: The attack deals cold damage
• Fey, Celestials, or Constructs: The attack deals force damage
• Plants or Oozes: The attack deals fire damage

If a creature belongs to more than one category, choose the damage type from any applicable category.