I'm gonna be helpful since some of you dont know how to attach swords, axes, etc using a spell/effect. First make a custom spell, I recommend using an aura since its fairly easy. Next change the name and everything to your liking and change the model to the weapon you wanna use on the unit. Next change the attachment point, the default is origin so change it to hand,right or hand,left. If your doing this for the first time, use a unit skill instead of a hero skill to test it. You can attach almost anything to a unit in this way, just gotta know how to set it up correctly and have the weapon model imported.