All the players in my game have equipped themselves with power weapons, thus making a large number of weapons much less of a threat since the weapon will quickly break. So any time my players are facing a melee battle meant to be challenging, I will need to change the enemy melee weapons. That isn't a problem, the problem is I don't want to go the boring route of giving power swords to almost everyone.
So what weapons exist in the various supplemental materials that can be threat to characters in power armour*, won't be broken by a power field, and are not power weapons themselves ?
Even if it is only a threat for an enemy with a high SB it is still useful.
*Even worse, the arch-militant started with a toughness of 50.