Note: this was originally posted on reddit. I am the same person who posted it on reddit.https://www.reddit.com/r/minecraftsuggestions/comments/arw43n/illager_knights/
Illager Knights are a mob. They can only spawn after the first 5 days of being in a world. They also spawn in raids after the 6th wave and 5% of pillagers spawned in outposts will instead be knights.
They can randomly spawn in plains and savannas. At night they spawn about half as often as a witch and during day they are 4x rarer than a witch.
They have 24 health points and iron armour. They wield an iron sword and a shield. They also ride a tamed black horse with iron armour and a saddle. If the horse is killed, they will NOT go on other horses.
On death, they drop 0-1 emeralds (affected by looting) and possibly their equipment.