Amplify

Whenever another creature within 40 feet of you casts or is successfully targeted by a spell, poison, or healing, you may use a reaction to cast Amplify and magically enhance the effect. You may choose one of three amplifications listed below. This spell can affect creatures subjected to both magical and nonmagical poison or healing.

• A creature cast a spell (choose one):
  • The spell's range is doubled. Touch-range spells range is unaffected. 
  • The spell's area of effect is doubled.
  • If the spell cast is capable of being upcast, treat it as if it were cast using a 5th level spell slot. This effect cannot reduce the level of the cast spell.
• A creature was targeted by a spell (choose one):
  • The target loses resistance to the spell's damage type until the start of your next turn. Creatures that are immune to the spell's damage type are unaffected.
  • Any damage dealt to the creature this turn will break its concentration on any spells it may be maintaining.
  • The target has a -3 penalty on its saving throw vs the spell's effect. This penalty is applied to subsequent saving throws against the same spell, but not other castings of that spell.

• A creature was subjected to poison (choose one):
  • The poison's duration is doubled
  • The number of successful saves to cure the poison is doubled
  • The poison deals 3 bonus damage dice equal to the poison's damage dice. This bonus also applies to recurring damage of the poison over time (if applicable).
• A creature was subjected to healing (choose one): 
  • The target additionally gains 3d8 temporary hit points
  • If the healing amount requires a roll, it heals the maximum roll instead
  • The target regains consciousness and recovers one level of exhaustion

This spell may be cast using a 6th level spell slot instead of a 5th. If Amplify is cast this way the caster may choose to affect their own spell or self.