So I'm a fan of Epic Fight Mod, so I made a datapack that change mobs from Medieval Entity - Forge. (maybe you will want to change the size of knight's group spawn to 1, you can make it by changing the "medievalentity_1.properties" in your config file).

To make the datapack work, I used (probably it won't work without these mods below):

• Epic Fight v.18.5.21
• Epic Fight - Indestructible v.18.5.3
• Epic Fight - Guandao Moveset
• Epic Knights: Shields, Armor and Weapons
• Mobs Properties Randomness
• Jet and Elia's Armors
• Medieval Entity - Forge

Check out the YouTube videos:

• Against Swamp Knight: https://youtu.be/ciVlxDUo5sE?si=1u6WiiVC6olVxJmZ
• Against Mountain Knight: https://youtu.be/mKNF4KWDG5E?si=Is3jts4Q9zk02w3n
• Against Hills Knight: https://youtu.be/WvlF-SzgUig?si=wU5MAV9Wmg_dcf02
• Against Desert Knight: https://youtu.be/FQOOI1JZaKQ?si=cHlEhIEGNp6MZa3Y
  
• Against Forest Knight: https://youtu.be/Ek24whc12BY?si=8RTO7T4Yax-eiOiz