Into the Realm Eternal Into the Realm Eternal is Chapter 3 of the Undead Campaign , Path of the Damned . It accounts for the events in which Arthas , aided by the ghost of Kel ' Thuzad , begins the siege of Quel ' thalas in his quest to reach the sunwell and revive the former necromancer . Prelude . Arthas , having slain Uther the Lightbringer under orders from Tichondrius , gains possession of the Urn of King Terenas . He uses the urn to preserve the already decaying remains of Kel ' thuzad to be revived at their chosen " nexus of powerful ley energies " , the high elves ' Sunwell . Battle . Arhas begins his conquest of Quel ' Thalas by ordering his minions to capture a local in the woodlands surrounding the outer elfgate . Arthas interrogates his prisoner concerning entry to the inner kingdom . The stubborn high elf insists that the " fallen prince " will not be able to enter their land , citing that not only their gates will protect their capital , but the enchanted forests as well . Arthas is not in the least bit moved by his prisoner ' s confidence , as he has come prepared with crude meat wagon s to aid him in clearing the trees to create a path leading to the elfgate . While the meat wagons clear a path , Arthas and his forces destroy a small settlement guarded by elven ranger s who were caught by surprise . The Undead Scourge mercilessly slaughtered any elf who tried to defend their land . Having successfully obliterated a high elven town , Kel ' Thuzad advises Arthas to construct a base on the site , as he senses that the energies of this place are strong . As he instructed his acolyte s to begin haunting the gold mine and summon structures to supplement their war effort , the undead forces are met with more elven defenders , this time led by the Ranger - General of Silvermoon , Sylvanas Windrunner . The couragous elf threatens Arthas to withdraw his forces , lest they taste the wrath of the high elves . Yet again , Arthas is unfazed by the elf woman ' s words , and he continued to fight until the elves were pushed back . Once Arthas ' undead bastion was in full operation to add to his forces ' already growing numbers , Arthas took his army deeper into the woods . There , he is met by Sylvanas and her forces again and again . However , as often as they attacked , so too were the undead able to push them back . Deeper into the fabled enchanted forests of Quel ' Thalas , the undead were also greeted by its wildlife and other sentient inhabitants , whom they thought were also rising up to halt their invasion . Just as any elf though , Arthas and his loyal minions killed and raised them alike . As the undead advanced , the outnumbered high elf forces retreated deeper and deeper towards the outer elfgate . The army of the dead overwhelmed each and every one of the defenders ' hamlets . The weary elves soon realized that everytime one of their own falls , the forces of their adversary grow . Though this did not stop the Elven Ranger Corps , they too soon fell and along with their leader , Sylvanas Windrunner , watched as the undead under Arthas ' command destroy the outer elfgate . Sylvanas , though knowing that she had failed to protect the outer elfgate , recalled her troops to fall back to the second gate . Sylvanas admits defeat at this gate , but she confidently told the Death knight that he won ' t get through the second . The mission ends with the undead claiming victory at the fallen elfgate .