Few monsters or spirits of the forest will take shape and form of either a person or an animal, an unnamed being always appeared as a huge boar a night. Which its distinction is its fire eyes and spitting bluish green flame to scare travelers at night.
In this case it got so mad on noisy talking feral herd while its trying to take a nap.
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Is this based on any existing mythology or folklore or is it an original creation?
Anyway it’s awesome!
Folklore, it was unnamed in the book I used for reference as it has the same shape shifting ability on other supernatural beings been reported, this one never revealed its true form but always appeared as a very huge boar at night.
Notorious bad creatures that usually appeared as a black boar and would walk around a pregnant woman’s hut it would be a variant of an Aswang known as " werebeast " ol folks say its usually the men took this form while women are the flying type Manananggal.
Old saying if you killed such beings it will revert back to its human form or supernatural one.
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“like liar’s pants im on fire”
look how far the light blue fluffy is flying
The boar came with a mad dash like a turbo charged car 
and we all know fluffy speaks can be very irritating as a herd.
…This is just a regular boar.
Love it! Reminds me of the boar gods from Princess Mononoke.
Local lore some supernatural being can turned into some large boar by description account, usually black colored and unsually behavior.