Automatic Tent

Appearing as a small bundle of firewood, touching 3 hidden runes will cause this to expand into a commander's pavilion with room for 8 people to sleep comfortably.  Touching the same three runes in sequence will revert the tent to a small bundle of wood - but it can only be done from inside the tent.  Requires a DC 14 DEX save to escape before the tent shrinks down or the individual is trapped inside.  It's then an action to make a STR check to free themself (DC 14), or 10 minutes of effort if combat rounds don't matter.