During the War of the Ancients, Neltharion the Earth Warder, Aspect of the black flight, convinced his dragon brethren to empower a powerful artifact called the Dragon Soul, claiming that it would thwart the impending invasion of the demonicBurning Legion. Sindragosa seemed to suspect that anything was amiss with Neltharion. Yet, she failed to voice her concerns, so the Aspects willingly imparted a portion of their power into the artifact.[8] However, Neltharion betrayed his dragon allies during the Legion's assault, provoking an apocalyptic battle in the skies over the Well of Eternity. Malygos and Sindragosa joined the blue dragons in surrounding the Earth Warder and charged the black dragon. However, Neltharion used the might of the Dragon Soul to strike out, decimating nearly all of the blue dragonflight. He confronted Sindragosa,[9] and the blast mortally wounded her and hurled her far across the land, deep into the icy north.[3][10][11]
Blinded and near death, Sindragosa sought desperately to reach the Dragonblight — the place where dragons instinctively travel to die. Weakened and no longer able to fly, Sindragosa plummeted to the cold earth in the peaks of Icecrown. The blue dragon gathered what remained of her energy and called out to Malygos for aid. Her only answer was the howling arctic wind as she struggled on, but the distance was far too great; agonizingly, she realized that her spirit would not find rest within the Dragonblight. Her life continued to fade away as her sanity deteriorated. In the midst of her delirium, Sindragosa's final thoughts turned to bitterness and hatred: hatred against the Legion, hatred against Neltharion, hatred even against Malygos. But most of all, hatred against the world of mortals. And in her dying moments, Sindragosa vowed revenge.[3][10]
Thousands of years later, Arthas Menethil, the Lich King, awoke from his long dormancy and journeyed to Sindragosa's Fall, where he raised Sindragosa into undeath as a mighty skeletal frost wyrm and ordered her to lead the Frostbrood into war.[3][6][12] The Lich King's final desecration of her was to tear the spirits of Sindragosa's lost whelps into undeath in front of her skeletal form, as a final affront to the great dragon.[13] Arthas was known to use Sindragosa as a mount.[2][11]
Sindragosa briefly appeared in the Pit of Saron after the defeat of Scourgelord Tyrannus. While the leader of the army of liberated slaves (Martin Victus for the Alliance, Gorkun Ironskull for the Horde) commended the adventurers for their bravery, Sindragosa rose up from the pit behind them and unleashed her fury, killing the leader and their army. The adventurers were pulled back to the entrance tunnel by Jaina Proudmoore or Sylvanas Windrunner at the last second, saving them from a grisly death.
Sindragosa later retreated to her lair in the Frostwing Halls of Icecrown Citadel, where she continued to strengthen her brood with the help of Ymirheim's vrykul.[14] After Valithria Dreamwalker was rescued by adventurers, she gave the heroes verdant life crystals, instructing them to battle the Frost Queen until she was weakened, and then use the crystals to coax out the essence that was dormant within her.[15] Similarly, Darion Mograine instructed would-be wielders of Shadowmourne to grant Shadow's Edge its final infusion of power by subjecting themselves to four of Sindragosa's frozen breath attacks before ultimately destroying her.[2]
Sindragosa defended the Lich King in Icecrown Citadel until the adventurers destroyed her, leaving only her skull behind.[3] But rather than leave her to suffer again in some form, the heroes took her crystalline essence to Kalecgos at Wyrmrest Temple, where she could truly be laid to rest.[11] Upon receiving the essence, Kalec stated "So much suffering, so much needless destruction. These have not been kind times for my brothers and sisters. But thanks to your efforts, brave adventurers, this darkened yet still noble soul may find peace at last. Rest now, Sindragosa. You are home...."[15]
Dragonflight
This section concerns content related to Dragonflight.
When the Dragon Isles reawakened in 40 ADP, Kalecgos, the new Aspect of the blue dragonflight, traveled to the Azure Span to reclaim the Azure Oathstone in hopes of restoring his aspectral powers. When he attempted to activate the oathstone, a simulacrum of Sindragosa, an arcane construct created from her knowledge and memories, appeared before him. Expecting Malygos, the simulacrum surmised much time had passed since she was active. Kalec then explained what had happened and worked with her through his many endeavors.[16]
Eventually, Kalecgos and Sindragosa's simulacrum worked together to find more members of the blue dragonflight scattered across Azeroth, so that they could free the souls of Malygos and Sindragosa to finally rest in peace. Upon being released, the soul of Sindragosa connected with her simulacrum, making her see and feel everything that she went through alongside Kalecgos in recent times. Malygos apologized to Kalec for the burden he left him with, but in the end, both realized that Kalec was a good leader for the blue dragonflight, and that they were finally able to rest. The Spellweaver and his Azure Queen then departed to the afterlife, hand in hand.[17]
She also appears as a boss in the expansion's single-player Missions.
Sindragosa the Blue debuts her draconic form before being raised as a frost wyrm. Her flavor text reads: The mighty Sindragosa was once a benevolent queen. She ruled the blue dragonflight as the Frost Queen. With her lover Malygos at her side, she fought to protect her subjects until the bitter end.
Spring Love Sindragosa shows a version of her as a whelp, her art sharing a spot with Twitterpatted Malygos. Her flavor text reads: Even Sindragosa was a lovesick whelp once.
Sindragosa of the Scourge has the frost wyrm encased in icy armor for the March of the Lich King. Her flavor text reads: Ever the Lich King's faith-lost servant, Sindragosa rose from the icy wastes. All would suffer as she once had.
She reappears as Frost Queen Sindragosa, a Colossal Death Knight legendary minion in the Return to Naxxramas mini-set. Her flavor text reads: "With her final breath, Sindragosa cursed her consort and all who abandoned her to die in Icecrown. When she was reborn by the hands of the Lich King, her first freezing exhale wrought only pain."
After her death in Icecrown, her soul was sent to the realm of Ardenweald and became known as Sindragosa the Restored. Her flavor text reads: With her spirit restored, Sindragosa wanders Ardenweald free of the burdens she bore in life and undeath.
Azure Queen Sindragosa, the blue dragon's past self before the War of the Ancients, appears as the Fabled legendary mage minion in the Across the Timeways expansion alongside Azure King Malygos and the Azure Oathstone from the Azure Archives. Her flavor text reads: Once Malygos' beloved mate, Sindragosa was among the first to suspect the corruption that had overtaken Neltharion. She came to regret not trusting her suspicions. Her visage also appears on the Arcane Barrage common spell. Its flavor text reads: Arrrrrr I got me cane and I'm gonna barrage you with it!
Sindragosa's name is likely a portmanteau of the words "sin" and "dragon", along with the traditional female blue dragon suffix "-gosa".
Sindragosa was featured on the Wrath of the Lich Kinglogin screen first introduced in patch 3.0.2. Many players came to love and/or hate her ferocious roar.
Sindragosa was one of the first two Icecrown Citadel bosses to be announced, the other being the Lich King himself.[18]
Unused storyboards and animations for the Wrath of the Lich King opening cinematic indicate that at some point, the cinematic was to depict the battle between the dragonflights over the Well of Eternity and Sindragosa's subsequent death.[19]
Like Lord Marrowgar, Sindragosa's model was changed in China due to Chinese law prohibiting the showing of bones in video games. Therefore, she instead uses a slightly modified blue dragon model.
In Heroes of the Storm, one of Arthas' Heroic abilities is "Summon Sindragosa", which causes Sindragosa to appear and fly over a portion of the battlefield, slowing and disabling enemies with her frost breath.
Sindragosa
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Sindragosa in Hearthstone
Sindragosa's Unchained Magic boss card in Hearthstone
Frost Queen Sindragosa in Hearthstone.
Spring Love Sindragosa hero skin in Hearthstone Battlegrounds.
Sindragosa of the Scourge hero skin in Hearthstone Battlegrounds.
Azure Queen Sindragosa in Hearthstone.
Azure Queen Sindragosa (signature version) in Hearthstone.
Sindragosa visage form in Arcane Barrage card in Hearthstone.
[Bloodbathed Frostbrood Vanquisher] and 
[Breath of Sindragosa] is a level 100 Frost death knight talent.
[Sindragosa's Fury] is a golden artifact trait for the Blades of the Fallen Prince, summoning Sindragosa to breathe frost on enemies.
Vision of Sindragosa.
Sindragosa's Chinese model.
Sindragosa in Justice Trailer.
The blue dragonflight reunited on the Dragon Isles.
Wrath cinematic concept art of Sindragosa in life.
Wrath of the Lich King Classic key art.
Sindragosa cinematic wallpaper.
Sindragosa in Icecrown by Bernie Kang.
Sindragosa in The Art of Blizzard Entertainment.
Sindragosa and Arthas by Bernie Kang.
Artwork of Sindragosa by Wei Wang.
Concept art of Arthas raising Sindragosa.
Concept art.
Concept art.
Concept art.
Sindragosa in the TCG (Assault on Icecrown Citadel).
Sindragosa in the TCG (Assault on Icecrown Citadel box art).
Sindragosa, the Frost Queen, in the TCG (Icecrown).
The Sindragosa Mega Bloks figure.
Sindragosa in Heroes of the Storm.
Sindragosa in crossover.
"Lich King - Empire of the Blizzard" by Jorcerca.
[Consort's Cold Core]
[Shattered Fragments of Sindragosa]
[Diadem of the Spell-Keeper]
[30R] Frost Infusion
[25-30] Where Dragons Fell
[Skull of a Frozen Whelp]