Bane has a 50' burst as range... how far are the casters from me now? Within 35' or further?
Not sure if you counted Eleven Immunities grants +2 vs Enchantments, also the rage song grants +1 to Will saves if there are any other buff/ reactions that can grant a +1 you'd make it.
We have access to Bless though? It negates Bane, correct?