Colossal Nature. The Yggdrasaur occupies a 50-foot-by-50-foot space on a battle map. It is immune to difficult terrain and is unaffected by forced movement.
Legendary Resistance (3/Day). If the Yggdrasaur fails a saving throw, it can choose to succeed instead.
Creature Sanctuary. The villages and structures on the Yggdrasaur's back are considered an extension of its being. Creatures on its back have half cover and are immune to area-of-effect spells or abilities originating from outside the Yggdrasaur. The Yggdrasaur can use a bonus action to teleport any creature on its back to its head or tail.
Mobile Oasis. The Yggdrasaur's presence sustains life in its surroundings. All creatures within 1 mile of the Yggdrasaur are considered to be in an area with abundant water and fresh vegetation, negating the effects of environmental hazards like dehydration. Additionally, the Yggdrasaur can use its Wisdom modifier for Constitution saving throws against environmental effects.
Divine Empowerment. The Yggdrasaur gains a bonus to its AC and saving throws equal to the number of creatures living on its back (up to a maximum of +5). When the Yggdrasaur is reduced to 0 hit points, it can choose to sacrifice the lives of up to 50 creatures living on its back. For every creature sacrificed, it regains 10 hit points and a bonus equal to the number of sacrificed creatures to all of its attacks and saving throws for 1 hour. This effect cannot be dispelled.
Symbiotic Regeneration. The Yggdrasaur regains 20 hit points at the end of each of its turns, so long as at least one creature is living on its back. If the Yggdrasaur is subject to fire damage, this trait is suppressed until the end of its next turn.
Multiattack. The Yggdrasaur makes two attacks: one with its Bite and one with its Stomp.
Bite. Melee Weapon Attack: +20 to hit, reach 20 ft., one target. Hit: 36 (4d12 + 10) piercing damage.
Stomp. Melee Weapon Attack: +20 to hit, reach 10 ft., one target. Hit: 48 (6d10 + 10) bludgeoning damage. On a hit, the target must make a DC 25 Strength saving throw or be knocked prone.
The Yggdrasaur can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The Yggdrasaur regains spent legendary actions at the start of its turn.
Heal (Costs 1 Action). The Yggdrasaur regains 30 hit points.
Tail Sweep (Costs 2 Actions). The Yggdrasaur sweeps its tail in a 30-foot cone. Each creature in that area must make a DC 25 Dexterity saving throw, taking 40 (8d8 + 4) bludgeoning damage on a failed save, or half as much damage on a successful one.
Earthquake (Costs 3 Actions). The Yggdrasaur stomps the ground, causing a tremor in a 60-foot radius. Each creature on the ground must make a DC 25 Strength saving throw. On a failed save, a creature is knocked prone and takes 33 (6d10) bludgeoning damage. On a successful save, a creature is not knocked prone and takes half damage.
Description
Yggdrasaur: A Living World
The Yggdrasaur is not a mere beast, but a paradox of nature and divinity. It is the living echo of the lost Primordials, those titanic beings of elemental chaos and raw creation that battled the gods in the Dawn War. Where others of its kind were shattered and their essence scattered to form the Elemental Planes, the Yggdrasaur chose a different path. It embraced life and stability, becoming a bastion of order in a chaotic age.
In the earliest days of the world, it wandered through the desolate deserts of Faerûn, its immense form drawing in moisture from the air and nurturing life on its back. The first settlements upon it were not the work of a single race, but a motley collection of desert nomads, lost explorers, and druidic circles who recognized its divine nature. The beast's sheer size made it a beacon and a sanctuary. The peoples who came to live on its back, a mix of humans, goliaths, and even some reclusive elves, found their lives inextricably linked to the creature. Over generations, they developed a unique culture of reverence and dependency, becoming the Yggdrasaursborn.
To the Yggdrasaursborn, the beast is their all-encompassing protector and provider. They believe its movements are guided by the will of the gods, a benevolent journey to bring life to the most barren of lands. The water it collects is a sacred gift, and the lush forests and fertile lands on its back are their inheritance. They have built their homes into the creature's natural landscape, with windmills and small villages nestled between its bony plates and the groves of trees that sprout from its hide.
However, the symbiotic relationship is not without its cost. The Divine Empowerment is a double-edged sword, a grim echo of the Primordial's power. It is a last resort, a desperate act of self-preservation that draws on the very life force of the Yggdrasaursborn. This act is the core of their faith's central paradox: their protector could, if pushed to its limit, become their undoing. The elders of the civilization teach that this is the ultimate sacrifice—a willing offer of life to ensure their world does not fall. It is a testament to the profound bond between the Yggdrasaur and its people, a bond born not of slavery, but of mutual survival and a shared destiny. They are not merely living on a beast; they are a part of it, a collective soul moving through the world, an oasis of life in a barren land.
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