Faction Protectors are blocks that are exclusive to Factions, being used to protect that the protector is placed in to prevent other players that are not in the Faction from from editing the blocks in the chunk.
You can buy faction protectors for 100 gold coins from the manage factions section you can place 4 factions protectors with a brand new faction but every 50 power gained you gain 1 extra placeable faction protector
Raiding[]
If at any point you exceed your faction's protector limit, they will be able to be raided by walking into the enemy factions’ chunk and pressing F. It will automatically give you a protector and remove the other one letting you raid that chunk