Heirloom Sphere

The Heirloom Sphere, also known as the Archmage Bane and the "Happy Fun Ball of Tricks", is a magical item that stores and conjures objects and acting as a teleportation device to reach the extraplanar manor of The Folding Halls of Halas. As of 836 PD, it was kept by Yussa Errenis in his mage tower in Nicodranas.

Description
The Heirloom Sphere is a puzzle-like sphere mixing clockwork and magic; it is polished brass and gold. The structure is Rubik's Cube-esque, in that some parts have to be rotated to a certain position to allow other parts to rotate, and where there are seams between the rotating parts, a blue-green glow emanates. It has complicated versions of conjuration glyphs inscribed on it, along with impossibly small engraving across the metal. The item blocks spells attempting to identify it or to scry on it.

Uses
The sphere is a device of both clockwork and magic, mainly designed for conjuration of stored objects. If the sphere's mechanism is set in the right combination, it conjures precious metals from the Thelashas's lair and gives a temporary access to a portable hole. Each time, the amount of precios metals conjured is half of the previous one. It also can teleport all creatures in the certain radius around the ball to the Folding Halls of Halas. After a time the combinations reset.

The Folding Halls of Halas
The Folding Halls of Halas is an extra-dimensional manor with about one hundred interconnected rooms, guarded by a blue dragon Thelashas in exchange for norishment, as well as other dangerous creatures who reside there including a froghemoth, bullywugs, and golems.

Before Campaign 2
The gurdian of the halls Thelashas said that Halas has placed several "pockets" around the world in order to tempt potential victims to Thelashas's lair inside the manor.

Twiggy stole the sphere from Sir Cadigan, who had held her imprisoned. Based on Twiggy's description of the location, both Jester and the Cobalt Soul believe she got it from the Exalted Collection Auction House in Port Damali. Twiggy brought it with her as she stowed away on several ships, eventually hiding on the Squalleater when it docked at Darktow. She figured out how to use the sphere to release coins.

Campaign 2: The Mighty Nein
Twiggy, Nott, and Caleb all investigated the Heirloom Sphere, realizing how to eject coins and make the ball produce a portable hole that stored Halas' winter equipment, which Beau, Nott, and Twiggy were able to pulled out before the mechanism reseted and the hole closed off. Twiggy eventually found the final setting that teleported and the Mighty Nein, except Yasha, to the Folding Halls of Halas. The next morning after the Mighty Nein had returned from the halls, Caleb Widogast examined the artifact. All the rings and buttons they had used the previous day were in different places, making their conjurations from the previous day impossible to replicate.

When they returned from the Lucidian Ocean, the Mighty Nein gave the Happy Fun Ball of Tricks to Yussa Errenis. In exchange, Yussa allowed Caleb to memorize a teleportation sigil for future teleportations to the Tidepeak tower once he learned the spell Teleportation Circle. Yussa also suggested that the Mighty Nein may come back at any time and explore the Happy Fun Ball further if they like.

Two months later, Yussa Errenis went through the Heirloom Sphere and disappeared while exploring the The Folding Halls of Halas. Caleb was able to manipulate the Sphere to transport the party to the diamond entrance of the Halls on their rescue mission and reaching for the Permaheart chamber where Halas has stored the heart of The Laughing Hand. Seventeen Exandrian days have gone past since the Mighty Nein entered the sphere and they found their way to the Permaheart and destroyed it.

While being chased by Trent Ikithon and Astrid Becke, the Mighty Nein excaped to the Yussa's Tidepeak Tower and were given by his assistant Wensforth an emergency Scroll of Plane Shift that teleported nine of them: Marion Lavorre, Yeza Brenatto, Luc Brenatto, and most of the party to Planerider Ryn's laboratory on the Elemental Plane of Fire. Beau, Yasha, and Fjord exceeded the nine person travel limit of the spell and had to enter the Heirloom Sphere that was brought by Jester to the elemental plane. Once Team Fire Plane returned to Exandria near the Evening Nip of Zadash, Yasha, Fjord, and Beau exited the Happpy Fun Ball and frantically told them to close it before the arrival of the clay golem that was chasing them. Caleb adjusted it and the sphere rearranged itself into a new configuration.

At some point after Lucien was defeated, the Mighty Nein delivered the Heirloom Sphere back to Yussa. During one of his visits to the Tidepeak Tower, Caleb asked him for the sphere, and Yussa proposed they study it together.