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Ice-types:
-1/2x from Water (They're the same thing, so why not?)
-1/2x from Electric (I've read conflicting information about whether Ice is a good conductor of electricity or not, but I'll just go with this.)
Fighting-types:
-1x from Fairy
-2x from Poison (Doesn't matter how strong you are if you get poisoned)
-1x from Bug
Fairy-types:
-1x from Bug
-2x from Psychic (Outsmarting a fairy/spirit seems to be a common way of dealing with them in folklore.)
Grass-types:
-1x from Ice (Made the most sense balance-wise, and a lot of plants are hardy enough to survive the cold just fine.)
That was actually pretty hard.