soooo, two things, one, the thing I hate the most about swd team, two, a crash possibly related to that, first of all, the fact that there is content, that you allow us to see, yet you cannot let us use it, if you want it in, but don't want it available to normal players, hide it, but to me, the fact that we can see it, I hate that, also my game crashed on giving myself the dashing sword. log simpley said game was forced into state stopped, errors may be discarded. 

and my world crashes on load... 

These weapons are HireSWD weapons, which have been payed for by their owners. Nobody else can use these weapons, except for devs and some staff members.

 this isnt the weapons fault,  when you try to give yourself this it should disappear out of your inventory and say "you are not allowed to use minecraft:air" it must be something wrong on your part, because i regularly try to give myself these weapons and they just poof away

even still, they should at least hide them in nei+tmi+jei, I would be fine if I couldn't see them there, however, since they are there, it just seems like a tease 

 heck, they could be dmg values of undamageable items, but the way they are now, I'm not ok with. 

(I made that account cause I forgot about this one)

I dont think they can hide it

how about just dont look at them?

There isn't a way to hide them as far as I'm aware, no

the actual sword of dashing is broken yeah

you will have to find a way to clear your inventory or deleting it from it

i suggest either using a nbt editor or deleting the player data