Sun Stone

Wondrous item, legendary (requires attunement)

The Sun Stone is a glowing gemstone sphere, 10-feet in diameter and magically fixed in place. Over a 24 hour cycle the Sun Stone changes brightness and temperature—it glows hot yellow for 11 hours, cools to a pale blue over 1 hour, then remains blue for 11 hours before warming again over 1 hour to its bright yellow illumination.

While yellow, the Sun Stone emits an aura of burning heat.

A creature starting its turn within 30 feet of the stone, or entering the aura for the first time on a turn, takes 4d8 fire damage.

The light emitted by the Sun Stone is considered sunlight during its yellow phase, shedding bright light in a 2,000-foot radius, and dim light a further 1,000 feet. During its blue phase, it emits dim light in a 1,000-foot radius.

A creature can attune to the Sun Stone by praying to it over a short rest while within 30 feet. Up to 10 creatures can be attuned to the Sun Stone at the same time. As long as you remain within 1 mile of the Sun Stone, your attunement doesn’t end and you can cast light, sacred flame (spell save DC 13), and spare the dying cantrips, at will. Additionally, you can cast bless, cure wounds, and lesser restoration each as 2nd-level spells once between long rests.

Five attuned creatures working together can move the Sun Stone up to 25 feet per round. Each creature must be within 30 feet of the Sun Stone, and spend its action to mentally assist moving the stone. Alternatively, a creature can use an action to make a DC 25 Strength check, moving the Sun Stone up to 10 feet on a success.