Go Int 150, Vit 120, rest you can put wherever you want, I put mine into luck for better drop rates.
Get the divine treasure Sleipnir (you can farm the items you need for it from Doppel, you can also farm Ignezim arena fight for 100% droprate card, and it stacks, so Id recommend to get about 3), get the first tier HP and SP recovery passives maxed, get chill out and relax from tier 3 if you want to, Magic Hand lv 3 and Stealth, Enhancement magic, Heal then get Magic Amplification, Nightmare Breaker, and Mind Break.
You can put the rest of the points in stealing for unlocking, or if you need more stats, appearance training is good.
Just use Mind Break, Magic Amplification, and Nightmare Breaker, you gotta recast Magic Amp every turn and Mind Break every 2 turns (if it hits, it only has like a 70% success rate on lategame bosses at rank 3, because they have status resistance).
You can use Pope or Elnin for the damage boost or just for heals, although they crash my game I think, so I just use Mema for more droprate.
Make sure to refine Sleipnir to max, you can farm Crystals lategame.
Good weapons are:
Rod of Survival: +15 Int, +500HP, 1/10 drop chance from Konata or gotten from premium box prolly.
Destruction: +30 Int -100SP, 1/15 drop chance from Vijyo
Balmun: All Stats +20 (Including Hit and Eva, so they actually double dip because you get Dex and Agi too), 500% Damage Cap, 1/15 from Sigurdrieva.
Make sure to refine weapon too, since Nightmare Breaker also scales a bit with STR, although INT is far more important.
When you actually fight you can switch out to 4 Jet Black Knight cards, although I only ever used one and that was enough.
Btw, you can squeez out some extra stats from evolving a pet, and that boost stacks when you do it multiple times, so you can get a 3rd tier pet for a significant boost to all your stats, like Vigonik, which also gives 500 extra HP, a tier 3 pet gives +10 all stats, and at max affection even more stats depending on which the pet favors, Vigonik has 20 ATK for example.
