Warden wraith form

The warden should have a "wraith form", which would solve both towering up and digging a tunnel to get away from it.  If the player is too high for the warden to reach, has blocked the warden off, or in a small tunnel, the warden would be able to enter a form where it is invisible, can fly, and can phase through blocks, but can't hit the player.  The player wouldn't be able to see the warden, except for when the warden senses the player, where the sculk vibration particles would travel to the Warden.  Once the vibrations touch the warden, the shape of the Warden's body would be visibly silhouetted for just a second and then fade away.  Since the warden senses the player every two seconds or so, the player should only get vague updates on the position of the warden, getting closer with every vibration.  Once the player goes out of their hole or off their pillar, the Warden will become visible and attack them.  If the player doesn't come out, the Warden will keep tracking the player until the they stop hiding or the Warden finds another player.  Knowing the Warden is waiting for you when you come out of your hiding spot is exactly the type of fear Mojang wants with the Deep Dark.