He pauses, answers carefully. "Partly it's a place, part--a competition or testing of sorts, for fighters, those that have magic or do not.
One starts at the south entrance, and there are a set of corridors and traps you have to pass through, either to the center or to find the other exit to the north. You can go in armed, and
either alone or with one other person.
The routes are 'patrolled' by various creatures. Some you have to outwit rather than outfight, others...you need wits and courage as well as
strength.
If someone succeeds at it, they win a reward--one they can choose, anything within the power of the Four to grant." He smiled ruefully. "One challenger of ours asked to be granted immortality, a human fighter, the last time. Another asked us to help his race learn to change forms, either temporarily or permanently. Sometimes winners ask for more mundane things, wealth, material objects; it's up to them.

There is no punishment as such for failure, someone asked--it isn't a 'safe' game." He smiled
wryly. "Ours never are. But this round is open to anyone of the family who'd care to try."