This technically applies to all of the blocks which assume the texture of their surroundings. But since the traps take more than a split second to mine, they can be used to provide visibility into the rest of the world if mined with a very weak pick or other tool.

Texture pack doesn't matter in this. As the block 'assumes' the blended texture of the block destroying sequence. Which is largely see through, thus providing vision past its self.

Whatever that block is, it's not related to this mod. If you're finding it in the dungeon that's probably because it's being placed there by another mod.

Thanks for correcting me there, sorry for reporting something not related to your mod.

Also thanks for making this mod, its awesome.