What the hell kind of useless weapon is the bone sword?

[Limimi]

So I get a bone sword (I think that's what it's called, I can't be sure because this game is broken) that only exists in this dungeon - ooh! I think, this will be fun! What does it do? Pressing A swipes, and it leaves an arc of electricity in its wake, very nice! What does X do? Breaks the game. Pressing X makes my guy do a little pose, and then absolutely nothing. Can't do anything by pressing the other buttons either. At least hammering Y over and over makes it stop after a while. Oh well, maybe it only works in rooms with enemies?... No. In rooms with enemies, it's extra ♥♥♥♥ed! Since you can't use the menu when enemies are still alive, there is absolutely nothing I can do except hold B and leave the dungeon. What the ♥♥♥♥? Is this a gag weapon?

Edit: That was the first time I had entered the dungeon while playing with the new DLC. I just went back in for my second go, got to the third floor this time, before entering another DLC dungeon and getting ♥♥♥♥♥♥ again - this time I was rolling over to the door and I hit the wall and fell off the side of the screen. And then I respawned OFF THE SIDE OF THE ♥♥♥♥♥♥♥ SCREEN! WHAT THE ♥♥♥♥?! I had one hour to play a game today and I have basically wasted it now.I really want to like this game, it has everything I want in a game except, apparently, competent ♥♥♥♥♥♥♥ developers. Jesus christ.

[TheWarlock]

The electricity is probably from your familiar rather than the bone sword (if you've got the blue slime following you, that's the electric one), as for what the weapon does, it's secondary ability increases your attack speed and damage so while it may not look like it's done anything, it actually has, but as with all trick weapons, this secondary ability will drain your health with every attack.

When it comes to the DLC dungeon you have to be careful on the third floor and lower, those aren't walls but rather dimensional space. You WILL fall and take damage when you roll into it. If you're spamming roll to move then there's a good chance you'll roll off again when you appear back on the floor, but so far I've never had my character spawn away from solid floor before.