Recaps

Karin warned Quel'Thalas of the Horde and Amani Troll invasion, then helped the elves and Alliance drive the attackers back, though dragonfire and the destruction of Kul Tiras’s fleet brought heavy losses. After the Horde withdrew for winter, Liadrin left to seek paladin baptism, Sylvanas settled her old dispute with Karin, and Kel'Thuzad called for a return to Dalaran to plan against the Horde.

• Orgrim Doomhammer and Zul'jin led the Horde and Amani Trolls toward Quel'Thalas, while Karin warned Sylvanas and then the Silvermoon Council of the coming invasion.
• After Karin convinced King Anasterian to prepare, the Horde overran elven outposts, and Karin helped evacuate villagers before joining the defense.
• Gul'dan broke through the elves’ defenses, but Anasterian and the Grand Archmage wounded him, and Alliance reinforcements forced Orgrim to retreat.
• The elves and Alliance pursued the Horde, and Anasterian declared that Quel'Thalas would join the Alliance.
• Orgrim sent dragons to burn the forest and attack the pursuing fleet, and Derek Proudmoore died after Karin carried him from the wreckage.
• After the Horde withdrew for winter, Karin gave Liadrin Glamdring before she left to seek paladin baptism, and Sylvanas settled her old dispute with him.
• Kel'Thuzad joined Karin and Khadgar, agreed that Khadgar would avoid punishment through daily meditation, and proposed returning to Dalaran to plan against the Horde.

Karin and Khadgar developed explosives that helped Dalaran defeat the Horde's red dragons, while Kel'Thuzad built Naxxramas. Karin then seized the Dragon Soul at Grim Batol and used it with the Eye of Dalaran to force negotiations over Alexstrasza's eggs and Deathwing's red dragon captives.

• Karin recruited Khadgar to stabilize nitroglycerin, and Kel'Thuzad began building the floating city Naxxramas.
• Khadgar produced powerful iron-cased bombs, and Kurdran Wildhammer prepared his Gryphon Riders to fight the Horde's dragons.
• Antonidas weakened the attacking red dragons with the Eye of Dalaran, and Kurdran's riders and Dalaran's mages devastated them while the Horde captured Southshore.
• Krasus revealed himself as Korialstrasz and recruited Karin to rescue Alexstrasza from the Dragon Soul's control at Grim Batol.
• Krasus and the other red dragons attacked Nefarian as a distraction, but Deathwing defeated them while Karin's party infiltrated Grim Batol.
• Khadgar stole the Dragon Soul from Nekros, and Karin used it to subdue the freed red dragons before smashing an egg in front of Alexstrasza.
• Kel'Thuzad brought Naxxramas to Grim Batol, and Karin threatened to bring the Eye of Dalaran and the Dragon Soul together when Deathwing demanded Alexstrasza's eggs.
• Deathwing agreed to leave with his kin in exchange for the eggs, Alexstrasza accepted, and Karin demanded the release of the captured Red Dragons.

Karin helped defeat the Horde and shape the Alliance’s recovery, then settled at Grim Batol and built a new domain through Wildhammer resettlement, accelerated livestock growth, and trade. The arc ended with Karin and Kurdran destroying hostile murloc and gnoll settlements.

• Karin refused Alexstrasza’s pleas to destroy the Dragon Soul, ordered the deaths of the red dragons who had fought for the Horde, and kept the survivors near Grim Batol to power his machines.
• Orgrim Doomhammer led the Horde through the Alterac Mountains to Lordaeron, where the Horde killed King Terenas and Varian Wrynn resisted until Anduin Lothar arrived and killed Orgrim.
• The Alliance routed the Horde, while Karin and Alexstrasza destroyed the Dark Portal and Khadgar searched its ruins.
• At the Alliance summit, Karin gained Stormwind’s backing for his domain and for a fortress at the Dark Portal, while Lothar chose to remain in the north.
• Karin discovered that the red dragons’ life magic suppressed Grim Batol’s curse, allowing Kurdran to lead tens of thousands of Wildhammer Dwarves back to the city.
• Karin used Growth Acceleration Magic to raise enormous boars with help from the Orc Peons and Dalaran mages, while Alexstrasza agreed to bless the animals in exchange for food.
• Karin’s preserved meat reached Stormwind, Ironforge, and Booty Bay as workers began building Antonidas Harbor in the Wetlands.
• After murlocs attacked a meat convoy, Karin and Kurdran destroyed their lair and then razed a gnoll settlement with explosives.

Karin’s expedition uncovered the origins of the Dwarves and Gnomes and recovered the Discs of Norgannon, inspiring him to build a Ley Line-powered floating city. As Ner’zhul reopened the Dark Portal and the Horde invaded Azeroth, Karin’s city arrived over the battlefield and its gryphon bombers struck the charging orcs.

• Karin led Brann, Kurdran, Lothar, and their companions into Uldaman, where they fought Troggs and Ironaya and learned from a Titan tablet how the Curse of Flesh had transformed the Earthen and Mechagnomes.
• Karin’s expedition fought Dark Iron Dwarves, reached the Seat of Khaz'goroth, and retrieved the Discs of Norgannon before Arugal teleported them away.
• Karin studied the Discs with the All-Knowing Eye, devised Norgannon's Core to draw power from Azeroth’s Ley Lines, and used it to raise Naxxramas.
• Gul’dan returned to Draenor and persuaded Ner’zhul to rally the remaining clans and reopen the Dark Portal, while Khadgar warned the Alliance that the portal’s energy was rising.
• Karin moved a mountain peak over Loch Modan to create a floating city, arranged for VanCleef to build a fortress, and prepared weapons and Dwarven Musketeers for the Horde’s invasion.
• Ner’zhul gathered nearly twenty clans and thirty thousand orcs at the Dark Portal, then Gul’dan reopened it and the Horde poured into the Blasted Lands.
• Danath’s forces fought the Horde and retreated toward Nethergarde Keep, where Khadgar joined the defenders as the city came under siege.
• Grommash and Hakkarim assaulted the Alliance fortress, but Hakkarim spotted Karin’s floating city and ordered a retreat as gryphon bombers dropped bombs on the charging orcs.