Appearance
An immense ovoid of translucent ice-blue crystal roughly 1 1/2 feet tall and weighing nearly 100 pounds. Frost blooms across any surface it touches. Inside the egg swirls a faint aurora-like glow, pulsing slowly like a heartbeat.

Even when dormant, the egg emanates a low hum of ancient power. Its surface is perfectly smooth yet faintly warm to the touch, despite the surrounding frost.

Lore
At the end of its thousand-year life, the Millennial Falcon freezes itself into an egg of pure arcane ice — a cocoon of winter magic that will, in time, thaw and hatch anew. Ages may pass before the cycle completes, though mortals have sometimes found the eggs prematurely and tried (foolishly) to harness their power.

Legends claim each egg contains a spark of divine winter — not truly dead, but dreaming. When the falcon stirs within, blizzards sweep across continents, marking its awakening.

Properties

Dormant Power.
While dormant, the egg functions as a potent magical focus. A spellcaster attuned to it gains a +2 bonus to spell attack rolls and saving throw DCs for spells dealing cold damage.

Aura of Eternal Frost.
While within 30 feet of the egg, nonmagical flames are extinguished, and creatures other than celestials or those attuned to the egg take 7 (2d6) cold damage at the start of their turn.

Cradle of Rebirth.
If the egg is kept within a consecrated or naturally cold area for a full year, the creature within begins to stir. During this time, frost spirits may gather, protecting the site from harm.

Fragile Eternity.
If reduced to 0 hit points, the egg does not break easily—it shatters reality instead. When destroyed by force or magic, it releases the essence of the falcon prematurely:

• A Millennial Falcon Hatchling (CR 9) bursts forth, confused and unstable.
• A Blizzard of Rebirth sweeps out in a 1-mile radius for 24 hours (treat as Control Weather, but temperature always drops to severe cold).
• All magic items within 100 feet must succeed on a DC 18 Constitution saving throw or become frostbitten and inert for 1d10 days.

Statistics
AC - 20 (arcane ice shell)
HP - 120 (16d10 + 32)
Damage Immunities - cold, poison, psychic
Condition Immunities - charmed, frightened, paralyzed
Size - Medium
Weight - 100 lbs.
Material - divine frost crystal

Destruction
The egg can only be destroyed by exposing it to the flame of a true phoenix while it rests beneath a new moon — an act said to bring balance to the cycle of fire and frost.
Otherwise, any damage simply delays its eventual hatching.

Optional Magic Item Variant: The Egg Fragment
Shards of a broken Millennial Falcon Egg retain traces of power. Each fragment (1d6 of them may form when the egg is damaged or hatched) acts as a Pearl of Power that also grants resistance to cold damage.

Notes: Requires attunement by A Druid, Ranger, or magic-user with a high (+5) Nature Skill