Do you have Elemental-Lighting on your armour? (Or is Trine non-elemental? I thought it was a Bolt spell, but I guess it could be a 3-way attack. Trine.)

Yeah, Big Guard helps tremendously. You get it by Manipulating the "Beach Plug" monster on the beach near Costa Del Soul. You could go and get it really quick unless it's too late or something. (Or you're too lazy, that's understandable )