WHM: how to?

[Sol_Aureus]

From the sound of it your party was being bad, they shouldn't be getting hit by flame breath or scythe tail. That being said, from what limited information you gave, I can give a few suggestions to improve yourself:

• Curaga
  Too many WHMs forget about this spell or stay away from it because of fear of enmity generation. Curaga is amazing, use it often. It's a little MP heavy, but WHMs should never have MP problems between Blissful Mind and Shroud of Saints. Don't fire it off immediately of course, but don't forget that you have it.
  
  
• Sacred Prism
  I noticed you said you used Sacred Prism Cura/Stoneskin and Regen when necessary. While Sacred Prism Cure/Cura is definitely nice (especially Cura) if more than 2 party members take AoE damage so Curaga won't hit them all, the vast majority of the time I prioritize Sacred Prism Regen over Sacred Prism Cure/Cura. The reason being Regen is the most potent and efficient healing tool you have as a WHM. It lasts for 45 seconds so keeping AoE Regen on your DDs significantly reduce the amount of HP you have to cure them by and increase their surviveability a lot. Stoneskin is definitely a good tool to use as well along with Sacred Prism, so keep that up.
  
  
• Benediction
  Even worse than Curaga, people are stuck in the FFXI mindset of 2 hours: the "BUT WHAT IF I NEED IT LATER IN AN EMERGENCY?! D:" mindset. The recast on Benediction is 15 minutes, it's very viable to use in standard situations. My rule of thumb is if 3 party members or more are in yellow, Benediction. Don't forget you have it, and remember that it's useless if you never use it.