[Voice] Sorry I lost this tag somehow!!
You'd probably need some strength and stamina to wield them. Again, depends on the sword in that case, big, small, heavy, light, long, short. Technique varies.
[He knows blades. Not so much swords, but he's not dumb, he knows the basics of how to fight with weapons. It was something he enjoyed studying at least, he just never physically trained with one.]
Also depends on how you're trying to kill them. Stabbing someone is easy enough but lopping of a limb or a head takes a lot of power.