Assuming I have cast the Blink spell on the previous turn and that I roll over 11 on the D20 for Blink at the end of my turn, can readying an action with the trigger "When I enter the ethereal plane, I run forward" during my turn allow me to move around for the time I remain in the ethereal plane?
If so, what rules, if any, govern my movement for the time I am on the ethereal plane? For instance can I walk through solid objects like walls?
If not, is it an issue with the wording of the trigger, or is there something restricting me from using my movement?
Best Answer
Yes, you'll be free to move but must return to within 10 feet of where you entered
From the description of the Ready action in the PHB or the Basic Rules:
Moving to the Ethereal Plane is certainly perceivable, so it works as a trigger. As per this QA, there is nothing about being in the ethereal plane that prevents you from taking a reaction.
As for limitations on movement, the DMG has this to offer on the Ethereal Plane:
So you can move up to your speed, you can move through any solid objects, and you can even fly, but you can't move through other creatures (or force effects). Unfortunately, Blink stipulates:
So you can spy through walls with Blink, but you can't travel with it.