• 1. Research Bloodeagle
  
• 2. Find a Kobold base with 2 or more Tiles
  
• 3. Clear 1 Kobold tile to get Boneyard
  
• 4. Wait till the Kobolds attack the cleared tile (they will send ~3)
  
• 5. Have one Shield Bearer at all times in that tile
  
• 6. Farm the 6 Stuns (very easy and quick)

Just make sure you always have one Shield Bearer in the tile when they attack so it counts as one continuous fight and just send another one in when your current Shield Bearer is about to die.