Mike_Kochis
I remember that there was mention of Hero weapons having weaker replica or weapons similar to them floating around but I don't remember if it was mentioned about a negative effect if they were wielded.
It was not; it burns Rhishisikk for other reasons. Given that the System of the true Legendary Weapons causes great damage as it clashes with the 'native' System of its wielder, some of the copies were made with this lethality in mind. The Forge of Loki just put that burn for non-hobgoblins to keep their copy to "proper people".