Golem Hearth
Crisis: Flip all Sleeping Golems that are not on the map to Awake.
This card holds any number of Golems. (You may spend Awake Golems here.) Their raid cost is 
each.
Act: 1
Q: If a Rival of the Caretaker spends a Golem and no one has resource slots on their player boards, do they keep the Golem or put it on Golem Hearth?
A: It returns to the Golem Hearth. The Golem Hearth can hold, or in other words "has slots for," any number of Golems.