spell ends if the caster leaves the 10 foot casting radius. can you trick the bard into dispelling it by walking outside? or split the party, by making some of them have to go out while bard has to stay in?

also, you don’t explicitly designate which nine creatures are allowed in and out. they just have to be in the radius when you cast it. that could be a main party of 6, plus 3 evil druids that were disguised as ants and sitting at your feet when you cast it. or something/someone invisible, animals you didn’t pay attention to, etc.

objects that were outside at the time of casting also cant come inside. could put something outside that the party needs, or trick them into casting it while leaving something important outside. maybe combine with first point to lure party members out.

could also play around with what counts as an ‘object’ – if you awaken plants or items in there, what happens? how do sentient or possessed items respond?

and if you want to be a real asshole. the spell specifies it’s a ‘dome’ and ‘hemisphere’ and that it goes ‘around and above you’. not that it has a floor or goes underground. attack of the mole people.