Long story short, they're broken. Darkmoon Blade can turn the damage output of a rapier from miniscule to that of a claymore except it attacks freaking fast. Sunlight Blade and Crystal Magic Weapon are barely better. The fact that they last for a minute or so is meaningless since most fights end within a minute, and there's really no drawback to using the buffs other than the chance of getting BSed while casting it (which is considered rude in the dueling community). I'm just surprised that people complain about claymores and WoG being overpowered when there's the weapon buffs, that massively increase weapon damage at no cost whatsoever.