The disappearance of Aranx's siblings opens a campaign through the Infernal Spire, while the invasion spreads into Lore and threatens Swordhaven.

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The Infernal Attack on the Celestial Realm

A falling sparrow and an unexpected eclipse have already troubled Aranx when a portal takes the floating weapons that embody his siblings. Calling out to Adaleaz, Athniel and Oriel, he promises to bring them home.

Elsewhere, Chamat thanks the Queen for another chance after she recreates a servant she still considers useful. Charged with destabilizing the Celestial Realm, he opens a route for the Infernals to invade.

The Queen intends to feed on the fear the invasion creates. Aranx suspects her hand in the theft of his siblings, but first needs to locate the invaders' portal and the prisoners taken through it.

Having already faced the Queen's servants, you answer Aranx's call to help find his siblings and cut off the invasion.

Finding the Portal

As the attackers close in, you gather the materials for Aranx to summon another ally, then recite the completed incantation while he casts. The helper who appears is Ilahi Sama, speaking as the Celestine and showing little patience for jokes while his realm is under attack. With his help, you begin locating the portal.

A stolen map and a decoder from the Dwakels' machinery lead you toward the Lost Ruins, where the captured Celestials are being held. Aranx warns that the Infernals corrupt whatever they touch, and although the realm's protections can resist for now, they cannot stop the continuing influx. You set out to free his siblings so they can help defend the realm, then cut off the invaders at the portal.

The Captive Celestials in the Lost Ruins

Dark energy weakens Aranx in the Lost Ruins, where you gather plants for him to assess the damage while fighting the creatures threatening nearby villages. The samples confirm that the corruption has reached the vegetation.

The Infernal Warlord has hidden his prisoners even from his own followers. Clues taken from the invading creatures lead you to their cage and its key, but the lock is not the only obstacle: a powerful spell binds the cage. You have the key anointed with holy oil and bring guard potions to restore the prisoners' strength. With gauntlets, onyx spikes and infernal crystals gathered for his counterspell, Aranx breaks the enchantment, and the key can finally release his brothers.

The Rescue of the Celestial Siblings

With Adaleaz, Athniel and Oriel free to rejoin the resistance, the defenders gain help against the knights still pouring into the realm. As the Celestials fight beside you, the Avatar of Life recognizes the enemy's stench as that of corrupted souls, and you promise to help save their home.

When the Infernal Warlord arrives to direct his army, Aranx asks you to defeat him before he can summon more reinforcements. You overcome his first form, but the fallen angel returns stronger than before as more creatures arrive from the underworld.

The Warlord and the Open Gate

With Aranx's siblings free, you fight through the incoming warriors to reach the Diabolical Warlord, and Aranx joins you against his second form. Together you defeat him and drive him from the battlefield, but Aranx still senses his power, and dark motes linger around a portal that cannot be closed entirely. When you ask whether the fighting has achieved anything, he answers that the struggle will continue: his siblings have been rescued and the commander defeated, yet the Infernals will always seek a way in, and the breach requires a lasting watch.

The Infernal Spire and Its Arsenal

That weakness later allows an Infernal Spire to enter the Celestial Realm, prompting Aranx to go inside and stop the new assault while Arzariel remains in command. When he does not return, Arzariel calls you and gives you an amulet to stay in contact.

Signs of a struggle lead you through the Spire to other Celestials who entered to fight and were captured. After opening their cells, you restore enough of their stolen energy for them to escape, though Aranx remains missing.

Aranx reappears after your confrontation with the jailer Garvodeus, explaining that he has been investigating the Spire. He believes its captives' Celestial energy is being used to make weapons against which Lore's peoples may have no defenses.

When the factory's override fails, you shut it down by destroying its machines, then defeat the overseer Azkorath. At the summit, you and Aranx discover that the Infernals have already produced an entire arsenal, only for Malxas to block your attempt to destroy it.

You defeat Malxas, but weakening him breaks his hold on the Spire, which begins returning to the Infernal Realm. Aranx urges you to leave immediately before it carries you away as well.

You both escape before the Spire disappears. Only afterward do you realize that the arsenal went back with Malxas. The factory has been damaged and this invasion driven away, but its completed weapons remain in enemy hands.

The Invasion Reaches Lore

After the first invasion, Aranx proposes the Celestial Guardians to watch the breach and invites you to join. You may accept, refuse to change sides, or offer help only while you choose.

After the Spire attack, Arzariel calls the realm safe for now, though neither you nor Aranx knows where the stolen-power weapons will be used next. They soon reach Lore, where Infernals wielding Celestial power assault Doomwood and burn Darkovia, forcing vampires and lycans to cooperate in their escape. Solani's people find refuge aboard Bonnie Blood's ship, but its crew refuses the lycans, leaving Constantin to send the vampires to safety and scatter his own people elsewhere in the hope of reuniting against the greater threat. When you bring the warning to Shadowfall, Gravelyn and Victoria are already fortifying it together against the Infernals.

The Defense of Shadowfall

At Shadowfall, Gravelyn refuses to abandon the fortress. Victoria has helped strengthen its walls and magical defenses, and you join Commander Tibias in holding back the Infernals while the defenders reload their weapons and reinforce weak points. Gravelyn intends to exhaust the attackers, then pursue them in Sepulchure's Flying Fortress. To make it airborne again, she needs time and help recovering what remains of her father.

She knows that a mysterious stranger is trying to restore Sepulchure, but fears that the Queen's influence has corrupted too much of his scattered soul. The fragment sheltered in the Doomblade has escaped that corruption and can sense another within Shadowfall's tower. You defeat the Bone Guardian protecting it and recover the fragment, hoping that gathering untainted pieces might keep Sepulchure from becoming the Queen's weapon. The Infernals breach the walls before Gravelyn can finish preparing.

As you fight the invaders and repair the damaged fortress, Dage forges a soul crystal using Infernal souls. Lord Balax'el intercepts you in the throne room, claiming the Queen has strengthened him since his defeat in Darkovia. You defeat him again and deliver the crystal. Gravelyn powers it with Sepulchure's soul fragment, lifting Shadowfall into the sky. The fortress becomes a way to follow the invasion and help its next victims, though the war is far from over.

The Fall of Swordhaven

Warlic summons you to Swordhaven, where Brentan prepares to resist the same weapons that devastated Darkovia. Rather than accept help from Gravelyn, he wants to turn the Infernals' armor and energy against them. You gather the materials while the mages attempt to adapt Tara's dragon-controlling ring to command demons without her permission. Tara brings Victoria into the dispute. Her sister insists that protecting the people must come before holding the city, and orders preparations for evacuation.

The Infernals arrive before the argument can be settled. You bring civilians into the castle, arm them and help the defenders hold the attackers back, repeatedly confronting the enormous worm that breaks through the courtyard. When Shadowfall appears above the city, Victoria orders everyone aboard while you continue the defense. Balax'el returns with another boast that the Queen will not let him fall. Defeating him buys time for the evacuation, but cannot save Swordhaven.

Only after the fortress pulls away does Victoria realize that Tara is missing. You spot her below, surrounded by Infernal soldiers and calling for her sister. Gravelyn says they cannot turn back in time, and Warlic tries to summon Tara as he summoned you. He cannot find her life energy and fears she is gone. Those aboard leave burning Swordhaven believing they have lost her, though they have not witnessed her death.