Wondrous Item

Legendary requires attunement by a creature with resistance or immunity to cold damage Requires Attunement

The Corona Aurora is an ancient artifact as well as the long-lost symbol of rulership over the Lhodos Tundra. For centuries, the kings and queens of the tundra wore the Corona Aurora and used its great power to protect their people from the harsh winters that so often threatened them. But then, a great evil rose and the king was forced to use the crown's full strength to stand against it. He did not return from wherever it is his final battle took place, and the Corona Aurora was lost with him.   Nondetection. The Corona Aurora defies attempts to magically locate it. Neither the crown nor its wearer can be targeted by any divination magic or perceived through magical scrying sensors.   Frozen Time. As long as you wear the crown, you don't age naturally. This effect is similar to suspended animation, in that your age doesn't catch up to you once the ring is removed. The crown doesn't protect its wearer from magical or supernatural aging effects, such as the Horrifying Visage of a ghost.   Magic. The Corona Aurora has 12 charges and regains all its expended charges daily at dawn. While wearing the crown, you can expend the necessary number of charges to activate one of the following properties:

• You can expend 1 charge as an action and use the crown to lower the temperature in a 120-foot-radius sphere centered on a point you can see within 300 feet of you. The temperature in that area drops 20 degrees per minute, to a minimum of -30 degrees Fahrenheit. Frost and ice begin to form on surfaces once the temperature drops below 32 degrees. This effect is permanent unless you use the crown to end it as an action, at which point the temperature in the area returns to normal at a rate of 10 degrees per minute.
• You can cast one of the following spells from the crown (spell save DC 17) by expending the necessary number of charges: Bigby's hand (2 charges; the hand is made of ice, is immune to cold damage, and deals bludgeoning damage instead of force damage as a clenched fist), cone of cold (2 charges), flesh to ice (3 charges; as flesh to stone except that the target turns to solid ice with the density and durability of stone), ice storm (2 charges), Otiluke's freezing sphere (3 charges), sleet storm (1 charge), spike growth (1 charge; the spikes are made of ice), or wall of ice (2 charges).
• You can expend the necessary number of charges as an action and use the crown to create either an inanimate ice object (2 charges) or an animated ice creature (4 charges). The ice object can't have any moving parts, must be able to fit inside a 10-foot cube, and has the density and durability of metal or stone (your choice). The ice creature must be modeled after a beast with a challenge rating of 2 or less. The ice creature has the same statistics as the beast it models, with the following changes: the creature is a construct with vulnerability to fire damage, immunity to cold and poison damage, and immunity to the following conditions: charmed, exhaustion, frightened, paralyzed, petrified, and poisoned. The ice creature obeys only its creator's commands. The ice object or creature appears in an unoccupied space within 60 feet of you. It melts into a pool of normal water after 24 hours or when it drops to 0 hit points. In extreme heat, it loses 5 (1d10) hit points per minute as it melts. Use the guidelines in chapter 8 of the Dungeon Master's Guide to determine the hit points of an inanimate object if they become necessary.

  Other Properties. The Corona Aurora is rumored to possess other properties that can be activated only by an evil being who can bind the crown's power to their will. Frost giants have long believed that the crown can be used to freeze entire worlds, while a djinni once claimed that the crown could be used to summon and control white dragons, as well as the mighty ice primordial named Cryonax.   Destroying the Crown. The crown is nigh indestructible, resisting even the intense heat of an ancient red dragon's breath. If the full power of the soulfire phoenix is focused upon it, the crown melts away and is destroyed forever.