I have to say to say you made me laugh abit BB xD
Zodiark is not weak to darkness, he uses darkness. You should use Excalibur lol.
As a little help: you can equip a black mask to take out the damage, but most of the times it wont work against his main attack. Try to kill him him at once, like in 30 secs, use Berserk if needed. He looks really weak at 1st, but if you dont kill him fast enough, he will use some protections, and just to take the last 10% of his life you will be playing for like 20 mins >_>. I think there are 2 spells that work when nothing else does, they are the last 2 you bought, i dont remember the name.
Good luck now ;)
againstall has invadedBECKY = 10/10