Always have cool drink, makes you immune to the sparks surrounding its body, not the fire though. That's where the Fireproof Mantle comes in. Basically gives you enough resistance to survive its supernova, but be careful it could still deal a lot of damage. So yes, combine it with Cool Drink as you should always make sure the effect is active. And if the supernova knocks you down, stay down as long as you can. You should be immune to the flames surrounding you during supernova. Remember, it attacks twice. Astera jerky is a must as well, as it can heal the red bar completely and fasten your recovery. Hopefully this helps.