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The dread sword known as the Trol'kalar (troll slayer, in the ancient tongue), was first known to be wielded by Strom's most capable warlord, Lord Ignaeus Trollbane, during the Troll Wars. After the war and with the departure of Thoradin's ruling descendants the Trollbane family ascended to the throne. The Trol'kalar image changed by also becoming a true emblem of power in that region, being rightly wielded only by the direct descendants of Lord Ignaeus as a symbol of rulership over the glorious Kingdom of Stromgarde.
The Trol'kalar's fame (or infamy) is probably attributed to its ability to easily dispatch any troll with a few slashes. From there came its name, Trol'kalar, and very possibly Ignaeus' own nickname which later became the new name of his bloodline, the Trollbane family.
After the Third War
With the mysterious death of Stromgarde's last ruler, Lord Thoras Trollbane, and because of the fragile condition of the Stromgarde nation, the Trol'kalar was sealed with Thoras in his tomb awaiting for the day when a new champion would rise from the people of Arathi Highlands and bring honor and glory to maybe the greatest Kingdom Azeroth ever knew.
A symbol of power or a tool of destruction? Why not both? The very name Trol'kalar is capable of making the mightiest troll tremble. So amazing this sword is that the very trolls, quite aware of the power of the dread blade, to brave members of the Horde, so it can be used against the trolls of Zul'Gurub. For they alone wouldn't dare to risk facing the Trol'kalar ever again.
After the shatteringThis section concerns content exclusive to Cataclysm.
This bastard sword is notched and old, but its appearance belies its sharpness and balance. Trol'Kalar pulses with a dim white radiance, almost as if alive. The weapon’s name means “Troll Slayer” in an ancient tongue. The scion of the Trollbane family, Prince Galen of Stromgarde, wields Trol’Kalar against forsaken, the Syndicate, murlocs and ogres instead of its traditional foes. The blade still proves deadly. ( )
In World of WarcraftThis section concerns content exclusive to World of Warcraft.
With Thoras Trollbane dead and his kingdom in ruins, the troll hunter Zengu was sent to the Arathi Highlands by order of Vol'jin himself, instructed to make every effort to claim Trol'kalar from the humans for use in the coming battle against Hakkar the Soulflayer and his legions in Zul'Gurub. Zengu dispatched agents of the Horde to hunt down the portions of the Sigil of Ignaeus that would open the tomb. After locating the four sigils and slaying Prince Galen, Thoras' son and leader of the remnants of Stromgarde, the Horde agents were able to bring Trol'kalar back to Zengu, who would then depart for Stranglethorn Vale for its use in the battle against Hakkar.
In CataclysmThis section concerns content exclusive to Cataclysm.
Zengu did not get far, however; according to Dark Ranger Alina at the camp known as Galen's Fall, Zengu was attacked and killed by Stromgarde troops before he was able to leave Arathi with his prize. The Stromgarde soldiers took back Trol'kalar and the Sigil of Ignaeus, dividing it once more among the surviving troops. Prince Galen, resurrected by the Forsaken, now directs Horde soldiers to once again find the divided sigils and reclaim Trol'kalar.
The player reclaims Trol'kalar and gives it to Galen.
In LegionThis section concerns content exclusive to Legion.
During the death knight campaign quest line, we see that Galen has taken Stromgarde as his base. He proclaims himself as a king and states that not even Sylvanas can oppose his rule. The death knights, including Thassarian and Nazgrim, slay Galen and retrieve Trol'kalar which they use to open the tomb of Thoras Trollbane. They then ressurect Thoras as a death knight. It is uncertain who now wields Trol'kalar, but the player hands in the quest to Thassarian, who may have given it to Thoras, but as a death knight follower, Thoras wields a weapon of another appearance.
When a troll is slashed by this bastard sword, it cannot regenerate as it would when hurt by a common melee weapon. The wounds heal at their normal rate, just as if the troll victim didn't count with additional regeneration powers at all. The Trol'kalar also procs additional holy damage to all evil creatures (trolls included).
The Trol'kalar curses any evil creature attempting to use it with one negative level (debuff). This curse inflicts the wielder as long as the sword is wielded. This one negative level curse cannot be cured nor dispelled, it will affect the wielder as long as he has the sword at hands.
Cataclysm quotesThis section concerns content exclusive to Cataclysm.
Nimboya: With Thoras Trollbane dead and Stromgarde in ruins, Vol'jin has instructed that we make every effort to spirit the legendary sword Trol'kalar from the humans' hands, so that we might use it in our coming battles against the trolls of Zul'Gurub.
Zengu: In ancient times, trolls fought against the Arathorian Empire and our most capable adversary, Lord Ignaeus of Strom, named Trollbane. He rode into battle wielding Trol'kalar - troll slayer, in their ancient tongue.
- Patch 7.0.3 (19-Jul-2016): Added.