The name says it all. That's where Dad (Hades) tries out his new punishment ideas, but he says the traditional ones still work best: the lava flows, the minefields full of exploding surprises, burning at the stake, running naked through cactus patches... You name it, we've got it here - Nico di Angelo
Rick RiordanWe need music," Nico said. "How's your singing?" "Um, no. Can't you just, like, tell it to open? You're the son of Hades and all." "It's not so easy. We need music." I was pretty sure if I tried to sing, all I would cause was an avalanche.
Rick RiordanI'm stupid," Leo mumbled. "Pi would expand outward, because it's infinite." He reversed the order of the numbers, starting in the center and working toward the edge. When he aligned the last ring, something inside the sphere clicked. The door swung open. Leo beamed at his friends. "That, good people, is how we do things in Leo World. Come on in!" "I hate Leo World," Frank muttered. Hazel laughed.
Rick Riordan