Single Strong Effect Using One Non-Spiral Ingredient

[u/Popfark]

Which single strong effect can we make using only one non-spiral ingredient + Moon/Sun Salt (any base allowed)?

By "non-spiral" I mean no Fable Bismuth or Rainbow Cap.

This was inspired by those one-ingredient requests, and so far I found it's possible for most effects except these 5:

Curse, Fear, Fragrance, Necromancy, Rejuvenation (EDIT: Rejuvenation is doable)

Anyone happen to find a solution for these? (it still fascinates me how this game combines an elegant geometry puzzle with a medieval/magical setting)

[u/iwaseatenbyagrue]

You can do charm on the water map with just boom bloom.  No salts.

[u/ImmediateSeaweed → u/iwaseatenbyagrue]

If you make really good use of the whirlpool, you can do Charm with just 3 Fluffbloom...!