I made full mage build and it was quite straight forward.
- Main: Summoner + Aero - in late game I was only using aero skills
- Fane: Wizard - Focus on Pyro + necro for healing
- Red Lizard: Cleric - Focus on Hydro + necro for healing
- Ifan: Enchanter - Focus on Aero + Rain
Fane was quite out for synergy with rest of the team, but it was necessary for enemies resistant to water/wind.
Mane battle strategy was to make everything wet, then Ifan and my main stunned every enemy with Superconductor, Dazing Bolt and chainlightning.
Massive battles required Thunderstorm which is OP.
Currently I'm doing Lone Wolf Fane as electric warrior. Equipped with staff, focused on pure intelligence going to use Warfare + Aero + Necro (for healing).