Second and First Age weapons belong to the very best weapons in the game and are highly sought after. There are also Second Age and even (quite rare!) First Age weapons. The basic weapon - the weapon you get at start - will be a Third Age weapon. There are legendary weapons for each class and for different class levels. So, if you want to advance the weapon to the max, you have to slay monsters and complete quests to get XP points for you legendary weapons (or items). You must level it the same way as you level a character class. A legendary weapon is a highly customizable weapon.