Thanks for your response, i will start working on unlocking D'art and Mordred i thought Hercules buff could be a good EX but i can learn from the mistakes lol, yes, i have 3 def downs, Mammon aoe def down, the dark SR is single target and Hercules is using the attack-def aoe down from Granuaile.
Other thunder element kamis : Indra, Perun, Skuld, Verethragna, and a last one only have an attack up def down buff, and a def up attack down buff
Other dark element kamis: Another Healer type SR with corruption debuff, damage single target and heals entire party for around 800 and light damage resistance buff 10% for all the party, Mephistopheles, Naberius, Astaroth.
About souls i have most of the standard ones, achilles, rosenkreuz granuaille elite, so im going to unlock Cassiopeia to work into D'art first.