Kael'thas shook off his slightly dispirited expression and said, "Everyone, do not forget the humiliation of the Sunwell. The nightmare humans brought upon our people was not merely a matter of energy. Arthas resurrected Kel'Thuzad, contaminating the source of the Sunwell with fel, plague, and shadow. Even though I have destroyed the Sunwell, that cannot stop those contaminated energies from radiating outward."
Every Elf present grieved. Quel'Thalas's 6,823 years of life had been destroyed practically overnight. The once peaceful, happy Eversong Woods had been contaminated by the Undead, and Silvermoon City had lost a tenth of its population. Such things would once have been unimaginable.
Kael'thas continued recounting his experiences on his journey south to Lordaeron. "I returned to Lordaeron to join the war against the Undead, but Garithos, a general of Lordaeron, repeatedly kicked us while we were down. The people who followed me could not accept this, so we left Lordaeron and chose to travel to Outland in search of energy with Illidan and Vashj, Highborne from ten thousand years ago..."
As they listened to Kael'thas's account, Quel'Thalas's leaders grew even more resentful of Lordaeron's humans and Dalaran's survivors. Patrick clearly remembered that while Kael'thas was fighting the Undead in Lordaeron, Garithos had constantly placed all manner of obstacles in his way. Later, Garithos had even transferred away all the knights, infantry, Dwarves, and other troops under Kael'thas's command, leaving him to withstand the Undead offensive alone.
The eventual result was that the Undead army attacked Kael'thas's outlying bases. Having lost so many troops, Kael'thas could not stop the enemy advance and could only retreat to that little island in the game, where he was surrounded by the Undead, like a caged bird or a fish trapped in a drying rut.
Moreover, when Kael'thas finally managed to secure