Thank you.
Well, it is not yet complete. The sword will give the ability to "see" things in this other dimension and also move defying gravity (prototype mechanism is done, I just need to use it).
And if you imagine that this is a level in-between levels, then it is not so pointless, I believe. You seek a sword; this may not be the first level, and as soon as you get it you may proceed to next levels/goals using your new powers.
If you head back to the entrance you can attack the barrier. There is also a hint saying so. Or gather again all the ioun stones which will also attack and drop the barrier.
This level has three endings. Go out with or without the sword and die (not really an ending, but, whatever, there is a different end story).