At this point in time, I think the Force Sword works a little too similarly to Chain weapons, albeit stronger. What doesn’t make too much sense is that the Warp Energy charged into the sword does very little “tick” damages while the hand blast at the end is what’s causing the most amount of damage.
In the Warhammer 40k Lore, Force Swords are weapons to be feared because of how powerful they are. However, as it stands the basic sword is weaker than even a dagger. This doesn’t make any sense since Demons would fear a Psyker with a Force Sword far more than a prisoner with a dagger.
So as it stands the Force Sword should do massive amounts of damage per swing, but at cost of raising peril as it’s swung. Then maybe when Peril reaches 90% the Force Sword is forced back to it’s weak state.
But, as it stands, Darktide Force Sword is the weakest iteration of the weapon seen in the 40k universe by far.