King Spirits -
Not the easist fight but if you've gotten the hang of the quick change between Sylph and Salamander not too bad. Immune to their own element.
Focus on Djinn first (Blue) as his attacks are easier to dodge while in Salamander mode to deal damage to him, Tornados and fireballs will be fired at the same time regularly and you'll need to alternate to avoid/absorb.
Once one is down they'll turn transparent but can still attack until both are down.