He is the last remaining Yaksha. The name Xiao translates to "night" or "evening" in Mandarin Chinese. Let’s explore 6 Xiao Constellations.
Xiao was once a proud and powerful Yaksha, but he lost his physical body during a battle against the foulest of spirits.
Now, as a Human Champion of Darker Affliction in Liyue Harbor, he's been reborn with a humanoid body and clouded memories from the past.
Legend has it that he killed the Vengeful Yaksha who had shrouded Liyue in shadow, and was on the verge of leaping off a cliff when encountered by the Traveler.
After a brief talk, Xiao decided to join the Traveler on their journey.
Dissolution Eon: Destroyer of Worlds (Level 1)
The destruction of the world is one of the favorite themes of Chinese mythology.
In Xiao's hands, The Destroyer of Worlds can be both a specter to strike fear into enemies, and an ally to ensure Xiao's friends are not affected by negative status effects.
It is used as an indication of vast age, and is often applied to ancient onds or stars.
In Buddhism, the word also means “destruction”, which may be the reason why Eons are usually those related to destruction.
This grants him additional immunity to crowd control, along with his base immunity lasting longer and provides him a much longer duration shield while also giving him additional weapon damage with each hit on an opponent who suffers from crowd control.
Annihilation Eon: Blossom of Kaleidos (Level 2)
It's got really good knockback and damage, making it one of the best Level 2 constellations. Annihilation Eon: Blossom of Kaleidos is unlocked after playing "The Emperor's Treasure" quest, and then heading to Mondstadt to unlock it.
Xiao creates an arena of thorns in an area, and the spikes will continuously deal damage to the enemy in the zone. After a short duration, the arena explodes and deals massive damage to enemies within the area.
Long ago the Scaled Dragon wielded the power to sweep across entire battlefields; its mantle of bright scales gleaming with a prismatic glory. Xiao shall reclaim this power.
Conqueror of Evil: Wrath Deity (Level 3)
He can use his sword to deal AoE Slashing DMG, which scales with the Constellation Level.
Players may then rotate the Kaleidoscope. Once all the Fragments are gone, a special item corresponding to that day's element will be released in its place.
When smashed onto the ground, Xiao deals AoE damage and leaves a circle behind. This circle's center contains a vortex that deals AoE damage per second.
Each enemy hit will give Xiao 1 stack of Wrath and they take 10% more damage from Xiao for 5s. At 20 stacks, enemies will be inflicted with Rage/Scream/Evil Mark, which lasts for 12s.
Once the most powerful king in the stars, he sacrificed his own eyes and voice in order to save both heaven and earth from vicious evil.
Now, humans no longer believe in him, and Xiao's heart has surged with anger. With a wave of a single fist, he will destroy all who scorn him... though he must stand alone.
Transcension: Extinction of Suffering (Level 4)
In Transcension, Xiao treats Shéntōng as states of consciousness that only occur in the most powerful forms of Enlightenment. Upon completing Transcension, the user is freed from all suffering and desires, transforming them into a deity-like being with immense power.
The ability is named after the legendary Buddhist monk whose powers were said to have helped him gather supplies to build many temples.
Jinzuu is a meditation technique that allows the entity to hide in an unnatural place - dense planets, with conditions unsuitable for life. When the entity is done hiding, it can come out of hiding and continue its existence.
This masterpiece is painted on the Huanxiu Linen, which lasts longer and is tough and durable. Xiao's brushstrokes are meticulous and long-lasting. His paintings have a natural and harmonious atmosphere, a charm that cannot be expressed in words.
Evolution Eon: Origin of Ignorance (Level 5 )
In Xiao's world, the Astragons of his pupils have been scattered around the globe. The Black and White Lair has become a place only inhabited by monsters.
Xiao uses all his power to pass on the origins of ignorance and summon weapons to fight off against ancient beasts and reclaim his homeland.
An ancient eon when ignorance manifested as nature's original consciousness.
This is the primeval moment that produces all phenomena, which includes physical and metaphysical worlds. Its tremendous power enables Xiao to control space freely.
It is my favorite constellation among others.
Further Reading: Talent Materials
Conqueror of Evil: Guardian Yaksha (Level 6)
Xiao is an excellent example of a lone wanderer. Gloomily marching down the path to destruction, his heart has been consumed by the darkness.
Enemies slain by Guardian Yaksha's basic attacks have a chance to drop Gold Plates.
If Xiao picks up the Gold Plate, he will enter a bloodthirsty frenzy, dealing a percentage of his Physical Attack as bonus Physical Damage for 4s.
Xiao is an Adeptus permanently residing in the Ley-Line Anomaly. He was born in the Cavern area of Liyue. This is the end of the xiao constellation, I will update if new ones come around.