If you want to check your progress, return to Zalsuhm and trade the weapon. The messages he gives you indicate your progress toward unlocking the Weapon Skill: * You have accumulated 0～49 Weapon Skill Points: * "I sense only a mote of energy p-p-present. You still have a long way to go, it seems." * You have accumulated more than 50 Weapon Skill Points, but less than 201 Weapon Skill Points. * "Aaah, yes... I can feel a marked increase in energy compared to when I first held it. Keep up the good w-w-work, hee hee hee..." * You have 201 to 249 Weapon Skill Points: * "The energy is threatening to burst forth. It won't be long now, hee hee hee..." * You accumulated all 250 Weapon Skill Points and can see the weapon skill in your menu when you have the Nyzul