So now I'm trying to storm this castle, this time with melee troops 
 
Castle wall breached.  His God/Leader comes plonks himself in the gateway.  My melee guys stack up trying to hit him and get through, only front guys can hit.  He is "ethereal", so I think what is happening is nothing, because I can't hit him, at least mostly.  Over time his archers etc. ruin my army.  What exactly do I need for "magic weapons" it talks about --- I don't think I have any....