Evil Humanoids: The Bitter Truth about Reproduction

d12
1. When biological alarm clock sounds off they go mad, rip themselves in half while laughing maniacally, each half grows into new humanoid
2. They're sloughing off microscopic zygotes all the time, everywhere they go, immediately enter Darwinian struggle for survival, competing viciously w/single-celled organisms, then insects, then small animals until only the hardiest/most ruthless reach full size
3. Release clouds of spores onto dead human bodies upon which humanoids feed/grow like a fungal bloom
4. Nasal cavities occasionally become stuffed up, blow larval humanoids out their noses
5. Steal human children, subject them to rigorous reprogramming, mutagenic baths
6. Random individuals suddenly stricken, swell to gross immensity before exploding, releasing 2d6 fully formed humanoids, immediately ready for action
7. Amputated parts, if watered regularly, grow into new individuals, donors, however, do not regenerate
8. Exposure to rays of harvest moon triggers budding, takes full season to complete during which they must be protected from harm
9. Powdered essence of humanoid sprinkled onto food of another creature initiates parasitic pregnancy in stomach w/predictably gruesome outcome
10. Singular bubbling cauldron in secret location deep in the Underworld, filled w/primordial soup from the dawn of time, spews forth new humanoids by the dozen
11. At the end of humanoid's life cycle head erupts into dandelion-like flower, releases hundreds of seeds into the wind to grow upon tilled soil in lieu of intended crops
12. Annual unholy ritual begins featuring incessant dancing, cacophony of drums, crazed chanting, copious bloodletting, imbibing of mind-bending intoxicants, entirety of population swept up in riotous bacchanal, how, no humanoid can say but by the next day population has increased by 33%