Defeat The Black Star Conditionally - Path of Exile

The Black Star Guide

To encounter the Black Star, the player must progress through the Searing Exarch's questline to obtain a Polaric Invitation to allow access to the Polaric Void. Afterwards, tradeable versions of the Polaric Invitation can drop in any T14+ Map influenced by the Searing Exarch after defeating the Searing Exarch once.

Invitation:	Polaric Invitation	Incandescent Invitation	Writhing Invitation	Screaming Invitation
Location	Polaric Void	Absence of Patience and Wisdom	Seething Chyme	Absence of Symmetry and Harmony
Area Level	83	84	83	84
Boss Fighting:	The Black Star	The Searing Exarch	The Infinite Hunger	The Eater of Worlds

The Black Star Fighting

The Black Star is one of the Eldritch Horrors. It serves as one of the minor bosses of the Atlas of Worlds during the Siege of the Atlas.

Life: 1400%	Energy Shield From Life: 50%	Evasion: +50%	Ailment Threshold: 294%	Resistance: Fire(50), Cold(50), Lightning(50), Chaos(30)
Damage: 160%	Accuracy: 100%	Critical Strike Chance: +5%	Critical Strike Multiplier: +130%	Attack Distance: 4 ~ 17
Attack Time: 1.5 Second	Damage Spread: ±0%	Experience: 200%	Model Size: 125%	Type: Atlas Invaders Black Star Boss

The Black Star

Defeat The Black Star Conditionally Sentinel Challenge

Defeat The Black Star while fulfilling each of the following conditions.

While the area has at least 80% Item Quantity
Without gaining more than 5 stacks of Crushing Darkness or Annihilating Light
While you have at least 30 stacks of Annihilating Light and without gaining any stacks of Crushing Darkness
While you have at least 30 stacks of Crushing Darkness and without gaining any stacks of Annihilating Light

While the area has at least 80% Item Quantity

(1) You can purchase Polaric Invitation(>80% item quantity) from other players.

(2) Crafting: Alch/Scour or Chaos

Orb of Alchemy upgrade a normal Polaric Invitation to a rare Polaric Invitation.
Use Chaos Orb reroll it unitl the invitation has at least 80% Itme Quantity.
Or, you can use Orb of Scouring removes all modifiers from the rare item. Then, do it again.

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Without gaining more than 5 stacks of Crushing Darkness or Annihilating Light

The fight arena is split into half;cold zone and hot zone, and depending on which zone you’re standing you’re gaining a certain buff per second on that zone:

You’ll gain Crushing Darkness when standing on cold zone. Crushing Darkness: You take more Cold damage, less Fire damage and have additional chance to be Frozen.
You’ll gain Annihilating Light when standing on hot zone. Annihilating Light: You take more Fire damage, less Cold damage and have additional chance to be Ignited.

To do this challenge, you have to stay perfectly on the Splitting Line of the arena, so that you can reset the buff count on and off by switch-standing on both zone easily, just watch to watch out for each buff not exceeding more than 5 stacks, that’s mean not standing each zone for more than 6 seconds … so watchout for that while killing the boss to complete this challenge.

While you have at least 30 stacks of Annihilating Light and without gaining any stacks of Crushing Darkness

To do this challenge you’ll have to only stand on the hot zone while avoiding touching the cold zone to prevent failing this challenge, gain up to 30 stacks of the annihilating light buffs only then kill the boss to complete this challenge.

While you have at least 30 stacks of Crushing Darkness and without gaining any stacks of Annihilating Light

To do this challenge you’ll have to only stand on the cold zone while avoiding touching the hot zone to prevent failing this challenge, gain up to 30 stacks of the crushing darkness buffs only then kill the boss to complete this challenge.

PoE 3.18 Changes

Increased the damage of The Black Star's Fire Beam Skill. The Annihilating Light and Crushing Darkness debuffs now cause affected players to take more or less Fire or Cold damage from hits only (previously all Fire and Cold damage).
The chance for The Black Star and The Infinite Hunger to drop their Unique Items now scales with Map Item Quantity.
Atlas Passive Skill Points from completing Doryani's Machinarium and The Vinktar Square have been moved to rewards for defeating The Infinite Hunger and The Black Star.

Challenges

Defeat The Black Star without being hit by Astral Avalanche
Defeat The Black Star while the area has "Monsters have increased Attack, Cast and Movement Speed"

Defeat The Black Star without being hit by Astral Avalanche

PoE Astral Avalanchec

When the Black Star uses Astral Avalanche, hide behind pillars on the blue section of the arena. (Pillars on the red section will break.) Ensure you are angled correctly away from the meteors. The meteors will always fall in the direction from the Black Star towards the center.
When the Black Star uses her Beam, hide behind pillars on the red section of the arena. (Pillars on the blue section will break.) The Black Star will strafe slightly while using this attack.
Be wary that being in the red section gives you a debuff that makes you more susceptible to fire damage, and being in the blue section makes you more susceptible to cold damage.

Defeat The Black Star while the area has "Monsters have increased Attack, Cast and Movement Speed"

Polaric Invitation with "#% increased Monster Movement Speed"(Search).

Category	Name	Mods	Image	Weight
Prefix	Fleet	(25–30)% increased Monster Movement Speed (35–45)% increased Monster Attack Speed 0% increased Monster Cast Speed 19% increased Quantity of Items found in this Area 11% increased Rarity of Items found in this Area		1000

Mods

monster dropped item quantity +1500%
monster dropped item rarity +2000%
monster slain experience +100%
unique boss curse effect on self -66% final
Cannot be fully Slowed
cannot be stunned for 2000 ms after stun finished
cannot be stunned while stunned

List of Siege of the Atlas Invitation

Order	Name	How to use	Boss Fighting	Description
1	Polaric Invitation	Open portals to Polaric Void by using this item in a personal Map Device. In order to use it, the player must first kill The Searing Exarch in its quest. Afterwards, tradeable versions can drop in any T14+ Map influenced by the Searing Exarch. This item allows access to fight The Black Star and is a pre-requisite to drop an Incandescent Invitation.	The Black Star	Modifiers to Item Quantity affect the amount of rewards dropped by the boss
2	Incandescent Invitation	Open portals to Absence of Patience and Wisdom by using this item in a personal Map Device. In order to use it, the player must first kill The Searing Exarch in its quest. Afterwards, tradeable versions can drop in any T14+ Map influenced by the Searing Exarch after defeating the Dark Star in a Polaric Invitation.	The Searing Exarch	Modifiers to Item Quantity affect the amount of rewards dropped by the boss
1	Writhing Invitation	Open portals to Seething Chyme by using this item in a personal Map Device. In order to use it, the player must first kill The Eater of Worlds in its quest. Afterwards, tradeable versions can drop in any T14+ Map influenced by the Eater of Worlds. This item allows access to fight The Infinite Hunger and is a pre-requisite to drop a Screaming Invitation.	The Infinite Hunger	Modifiers to Item Quantity Affect the Amount of Rewards Dropped by the Boss
2	Screaming Invitation	Open portals to Absence of Symmetry and Harmony by using this item in a personal Map Device. In order to use it, the player must first kill The Eater of Worlds in its quest. Afterwards, tradeable versions can drop in any T14+ Map influenced by the Eater of Worlds after defeating the Infinite Hunger in a Writhing Invitation.	The Eater of Worlds	Modifiers to Item Quantity affect the amount of rewards dropped by the boss

Siege of the Atlas expansion

After defeating Kitava, you will meet Commander Kirac in the Karui Shores and join his militia to safeguard the Atlas of Worlds. The Envoy will inform you that two Eldritch Horrors, The Searing Exarch and The Eater of Worlds, are approaching and will consume everything.
By completing maps affected by their influence, you can hunt down their sub-bosses, The Black Star and The Infinite Hunger, before finally facing The Searing Exarch and The Eater of Worlds themselves. Defeating these formidable foes yields valuable rewards including exclusive new unique items.
The Atlas of Worlds has been revised, and regions have been removed. The regional Atlas Passive Trees have been replaced with one gigantic Atlas-wide Passive Tree that affects all maps you run. You can earn points by completing bonus objectives of maps and finishing certain Atlas quests.
The Watchstone system has also been removed, and replaced with Voidstones which are obtained by defeating The Uber Elder, The Maven, The Searing Exarch and The Eater of Worlds. These Voidstones raise the tiers of maps on your Atlas and can be augmented by Sextants.

List of Eldritch Currency

Tier	Name	Description	Drop Location
5-6	Orb of Conflict	Unpredictably raise the strength of one Searing Exarch or Eater of Worlds modifier on an item and lower the strength of another. Lesser modifiers that have their strength lowered will be removed.	The Maven and her encounters have a chance to drop the Orb of Conflict. This requires some luck and planning.
	Eldritch Chaos Orb	If The Searing Exarch is dominant, reroll prefix modifiers. If The Eater of Worlds is dominant, reroll suffix modifiers.
	Eldritch Exalted Orb	If The Searing Exarch is dominant, add a prefix modifier. If The Eater of Worlds is dominant, add a suffix modifier.
	Eldritch Orb of Annulment	If The Searing Exarch is dominant, remove a prefix modifier. If The Eater of Worlds is dominant, remove a suffix modifier.
1	Lesser Eldritch Ichor	Adds a Lesser Eater of Worlds implicit modifier to a Body Armour, Boots, Gloves or Helmet. This replaces any existing implicit modifiers other than Searing Exarch implicit modifiers.	Drops in all maps.
2	Greater Eldritch Ichor	Adds a Greater Eater of Worlds implicit modifier to a Body Armour, Boots, Gloves or Helmet. This replaces any existing implicit modifiers other than Searing Exarch implicit modifiers.	Come from exploring maps influenced by The Eater of Worlds.
3	Grand Eldritch Ichor	Adds a Grand Eater of Worlds implicit modifier to a Body Armour, Boots, Gloves or Helmet. This replaces any existing implicit modifiers other than Searing Exarch implicit modifiers.	Come from exploring maps influenced by The Eater of Worlds.
4	Exceptional Eldritch Ichor	Adds an Exceptional Eater of Worlds implicit modifier to a Body Armour, Boots, Gloves or Helmet. This replaces any existing implicit modifiers other than Searing Exarch implicit modifiers.	Drop from The Eater of Worlds.
1	Lesser Eldritch Ember	Adds a Lesser Searing Exarch implicit modifier to a Body Armour, Boots, Gloves or Helmet. This replaces any existing implicit modifiers other than Eater of Worlds implicit modifiers.	Drops in all maps.
2	Greater Eldritch Ember	Adds a Greater Searing Exarch implicit modifier to a Body Armour, Boots, Gloves or Helmet. This replaces any existing implicit modifiers other than Eater of Worlds implicit modifiers.	Come from exploring maps influenced by The Searing Exarch.
3	Grand Eldritch Ember	Adds a Grand Searing Exarch implicit modifier to a Body Armour, Boots, Gloves or Helmet. This replaces any existing implicit modifiers other than Eater of Worlds implicit modifiers.	Come from exploring maps influenced by The Searing Exarch.
4	Exceptional Eldritch Ember	Adds an Exceptional Searing Exarch implicit modifier to a Body Armour, Boots, Gloves or Helmet. This replaces any existing implicit modifiers other than Eater of Worlds implicit modifiers.	Drop from The Searing Exarch.