This is F3
They can't talk
They can't see
they can't hear
But they have teleportation,telekinesis, and telepathy
Granted all of that only works in their blank world....
So give them an item, even if they can't see/hear it, they can feel the vibrations.
You can also send messages if you'd like, but be sure to give them a translator first...
And don't be afraid to ask/send absurd things through that portal...
Because a blank world Is boring~