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serverSideOnly just tells the client to skip loading the mod if it's installed, you need to set the acceptableRemoteVersions property to "*" as well. This tells it to accept any remote version, including none.

The client only needs Forge installed if the server's mods need to be installed on the client. If none of the server's mods are required on the client, a Vanilla client can join. In what context? If you have a MinecraftServer argument available, use that. If you have an object with a method that returns MinecraftServer (e.g. World#getMinecraftServer), use that. If all else fails, you can use FMLCommonHandler#getMinecraftServerInstance.

Ok I figured out the invincible part. I just set the isEntityInvulnerable to true and then they can't be hit