Astral Bracelet (Patreon)

Wondrous item, very rare (attunement requirement varies)

An astral bracelet is a powerful magical bangle that allows its wearer to see, commune, or otherwise manifest things using powers beyond the Material Plane. The metal and glyphs of each bracelet are related to the kind of power that it holds. You can pull the bracelet off and hold it in the palm of your hand as an action. When you do, the bracelet unfurls to reveal the four inner rings collapsed within it, transforming the bracelet into an astronomical sphere. While the bracelet is transformed into the astronomical sphere, its inner rings slowly spin on their own.

The bracelet has 10 charges and regains 2d4 + 2 expended charges each day dawn. While holding the astronomical sphere, you can expend 1 or more of its charges to cast one of its spells. The sphere's spinning rings magically fold up again into the wearable bracelet if you expend the last charge from the sphere. You can fold the rings back into place early as an action. You can wear the bracelet again once its rings are folded up again (no action required).

Each bracelet can cast a different array of spells and may require different creatures to attune to them. Spells cast using the bracelet while it’s an astronomical sphere use your spellcasting ability modifier and spell save DC. Components that cost less than 100 gp are ignored when casting a spell in this way. 

The rings spun wildly as the incantation finished. Blues and reds and bursts of golden arcane energy flung from the astrolabe. Stars sputtered in and out of existence around them as the ground beneath Galan and his companions bent and curled between their feet. Suddenly, as if just waking up, the world around them was different. Flames billowed around them and the heat was almost unbearable.

Galan looked down at the sphere in his hand. One of the rings sputtered to a halt, while the others continued to move lazily about on their own accord.

He folded the rings back into place, forming a bracelet of the astrolabe, before replacing it on his left wrist. He winced a little as hot metal bands touched his skin.

"Can't that thing do anything pleasant, Galan?" asked the armored warrior to his right. She was in for the worst of it, given this heat.

"Only as pleasant as the world around us can be. It warps the fabric of planes: not the nature of them."

The party continued forward, making their way toward the dark, looming tower before them.