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I think red is saying that, for example, you can grapes or angel Philistine Garrison but you cannot do that to FW. But functionally they do the same thing the only difference is that, in this case, FW has a larger range. Generally you can use dominants on immune characters as they are only immune to heroes. Prince of Persia is an exception though and would do the same thing if it was protected from dominants.
Your magicians and Egyptians are immune to all Heroes and Dominants while this card is in battle. Cannot be prevented.
An ignore ability has four parts: 1. it grants the ignoring card immunity to all cards being ignored2. it grants the ignored cards immunity to the ignoring card3. characters not in battle and ignored cannot enter battle (i.e., you cannot choose to bring them into battle and they cannot be targeted by an ability that would bring them into battle)4. characters already in battle and ignored are treated as though they were not in battle for purposes of determining battle outcome