Friendly dominion is required.

"Terrains" is true in any combination of caves/mountains/highlands, otherwise false.

"Your cap" also technically includes Shinuyama's cap, both of them have the flag used for this for some reason.

Number of spawn attempts is Turmoil + 1.

If End of Culture is up, add Turmoil again (so it becomes 2*Turmoil + 1).

While the number of spawn attempts > 0:

• 66% to just flat out fail (-1 spawn attempt).
• If (terrains or your cap) and a 2% chance: Amanojaku (-2 spawn attempts)
• If (terrains or your cap) and a 80% chance: Kuro-Oni (-2 spawn attempts)
• If (terrains or your cap) and a 70% chance: Oni (-2 spawn attempts)
• 30% chance per cold scale: Ao-Oni (-1 spawn attempt)
• 30% chance per heat scale: Aka-Oni (-1 spawn attempt)
• Otherwise: 1d4 (non-exploding) Ko-Oni (-1 spawn attempt)

(Once a single check succeeds, go spawn the units, subtract the spawn attempts, and then go back to the top of the bullets)