that's just a fancy name for a vault


notes on summoning aspects for my own reference:
neutral - tea set; condenser
sun - garden sunlamp
moon - starry orb
void - thief's bag; unfood
heart - virtuoso's flute; friendship bracelet
air - bubble wrap
lightning - egg timer; tuning fork
fire - seasoned pan; baking spices
metal - puzzle box; shiny coin
stone - figurine of prosperity
wood - flourishing bonsai; wild seeds
water - garden fountain; thick gel
ice - mirror of solitude

all of this is based on my own observation, plus some healthy cross-referencing from others