Wall of force / Tremor sense help eeded

[Khelvan]

I have to prepare the showdown with some bbeg Guys and need some help to clarify things.
First can you use Passwall to get through a wall of Force?

Second if you are in an area with Nondetection and you approach
an Dragon with tremor sense.
If one uses Invisibility, the tremor Sense would help?
It wouldnt be affected from the nondetection since its not magical, right?
Any help welcome.

Khelvan

 

[matthewajg]

Passwall cannot get through the wall of force (spell description - "You create a passage through wooden, plaster, or stone walls, but not through metal or other harder materials"), as the PCs would need a disintigrate spell to get through it, or dimension door or a teleport to bypass it.

Nondetection has no area of effect, rather it is used to ward an object or creature (spell descr - "The warded creature or object becomes difficult to detect by divination spells such as clairaudience/clairvoyance, locate object, and detect spells. Nondetection also prevents location by such magic items as crystal balls"). Tremorsense would allow the dragon to sense where the creature or object was, regardless of whether or not it was warded with a non-detection, as long as the creature or object in question is in contact with the ground and within the range of the dragon's tremorsense. Also, invisible creatures would likewise be sensed as long as they are in contact with the ground...as tremorsense is tactile and non-visual, invisibility is useless against it.

 

[moritheil]

To be fair, if you're fighting dragons and using walls of force, it's well within your means to not be touching the ground.

Do these dragons have blindsense as well as tremorsense? That's another consideration.