Time Bubble

You surround yourself and those near to you in an isolated time bubble.  Inside this sphere, time moves at a breakneck pace, or perhaps, time stops outside of it.  Regardless, those inside find themselves separated from those outside.  When you cast the spell, any creature within 10 feet of you are pulled into the time bubble until the start of your second turn since the casting.  Creatures and spell effects cannot exit or enter the region for the duration of the spell.  For the duration of the spell, only creatures inside the bubble take their turns.  When the spell ends, all creatures return to their previous place in initiative.