Semi-unknown Were-things

Transforms into anthropoidal parody of....
d12
1. Rooster
2. Ape
3. Butterfly
4. Badger
5. Worm
6. Swine
7. Devil
8. Paramecium
9. Lamprey eel
10. Whale
11. Virus
12. Famous monarch

...when triggered by...
d12
1. Solstice/equinox
2. Ascending constellation
3. Toll of church bells
4. Sundown
5. Return of predictably regular comet
6. Exposure to subterranean gases
7. Hunger pangs
8. Thunderstorms
9. Sudden highly-charged emotion
10. Pain/injury
11. Victory at arms
12. At will

Proclivity
d12
1. Hunger for flesh
2. Thirst for blood
3. Killing for sport
4. Self-destruction
5. War on property
6. Urge to smash the state
7. Hell-bent on undermining religion/desecrating shrines
8. Must reproduce w/human host
9. Evil oratory
10. Seeks to irritate and disrupt
11. Attention-seeking behavior
12. Looking to merely humiliate/satirize humanity

Can only be destroyed by...
d12
1. Random metal (d12: 1-2 copper, 3-4 electrum 5-6 gold, 7-8 platinum 9-10 unalloyed iron 11-12 space metal)
2. Several thousand pounds of crushing force
3. Lightning strike
4. Withering criticism
5. Overdose of opiates
6. Severe food allergy
7. True love
8. Gluttony
9. Empathy for the innocent
10. Exposure to moon dust
11. A certain song
12. Large sums of money