Loose your weapon to the boss?
If you die at a boss character in PSO, here's a little trick to get back your main weapon. Before you fight any boss, set a telepipe (or use the spell Ryuker if you have it) close to the boss teleporter. Now, if you die fighting the boss, go back to the main town, and take the telepipe you set back to the boss teleporter. Go back to the boss character, locate where your weapon is and get it. As long as you DON'T equip your main weapon, and keep it in your inventory you'll keep it even if you die to the boss.