tehlemon Longer games (I am currently on the 4th cycle of a 90-day game) are just as easy: get two Insect Girls, breed them, hatch the eggs in a prepared hatchery, give to Insect Queen** for -3 Corruption per egg.
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without any fine-tuning of the breeding pair: 4 eggs hatch in 2 days, giving them to Insect Queen results in -12 Corruption for both Creation and Druid. If I completely dedicate all rooms to the task by upgrading them appropriately, I would be getting
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every 2 days.
Short games lack the room to raise corruption by much, long games have the room to fix things.
**You need to invest in Girata first, though. Then again, "measly" 4k gold + leveling her. The Queen wants Insect Girls (hybrids included) with either trained sex skills or max energy; Energizing upgrade for hatchery rooms makes the hatched IGs fulfill the second condition.