Know this thing ?? It's Fou-Lu Equipment, right ?? Royal Sword Royal Armor You can use them though!! Steal'em in the last battle with Tyrant and Astral, and you won't regret it.
Another thing, if you trade 99 cards in Mannillo shop, you get Render for Scias, which is the most powerful weapon in the game. It's attack stat calculation is: 50+[encountered monster/20]. In simpler terms, if you encounterd 3000 monster, it's attack stat will be 50+3000/20 =200 attack power. The more monster you encountered, the more powerful it will be!!!!
To do this go to Sinchon, then wander around to find Bot(s). In here, just use magic Firewind= Burn+Eddy or Sever. They will do nothing for three rounds and their EXP will be doubled!!! Do this ten times and heal them so they don't get KOed and you will get more than 60,000 EXP !!!! The more Bots you find the more EXP you get !!!