Um I've just really read the artifacts section and it says
A model may take one of the following:
Brazen Rune, Skull-helm, Armour
A model may instead replace one weapon with one of the following:
Goredrinker, Bloodshed, Kor'lath.
RAW does that mean you can only take 1 Artefact, 2 if you decide to take weapons but you would never put 2 melee weapons on a character.