Other ideas:
Any long-range or battlefield-wide attacks. e.g. Farstrike
Assassins and assassination spells.
Summoning lots of air elementals & other lightning-immune air summons.
You don't happen to have the "useless" Air-9 bless do you? If so, Masters of the Five Elements would have 125% shock res...
Thunder Ward & Storm Warriors
Nailing their army with Murdering Winter
Hide underwater.
