To avoid further complications, Arthas, after relaying certain information to Illidan, did not linger in the Warden's dungeon beneath Mount Hyjal and left immediately.
Illidan had been released, and his goal was achieved. Moving forward, Illidan, in his pursuit of greater power, was bound to attract the attention of the Burning Legion's master.
This was destined to happen because Illidan had abandoned conventional magic and techniques, turning instead to the study of fel. His intention was to use this energy to develop more efficient ways to slaughter demons.
Illidan's vision was already broader than that of most Night Elves, but unfortunately, he still hadn't realized that the Burning Legion was merely a tool Sargeras used to improve his 'cleansing' efficiency. Whether or not this Legion existed was utterly irrelevant to the Dark Titan.
To eradicate the threat of the Burning Legion, it was less about fighting demons and more about fighting the Dark Titan Sargeras. As long as he had not given up his plan to destroy Azeroth and all planets that could potentially nurture Titan World-Souls, then even if all the Burning Legion's demons disappeared, the problem would still not be solved.
The civilizations on Azeroth, even united, might be able to withstand wave after wave of the Burning Legion's assaults, but they would absolutely not be able to stop Sargeras from bringing down a destructive sword upon Azeroth.
Indeed, for Sargeras to destroy Azeroth would be a matter of a single strike.
Let Illidan attract the attention of Kil'jaeden and Sargeras; Arthas needed someone to stir the pot, and Illidan's inherent trouble-magnet nature made him the perfect tool.
The plan to rescue Illidan from imprisonment had been relatively smooth, but Arthas had actually given some thought to that final stab at Nasa.
Even without that stab, Arthas still had ways to make Nasa lose consciousness and resistance, but that would certainly consume more time. The direct trauma caused by Frostmourne, however, could quickly drain a living being's consciousness and physical strength.
That sword truly pierced Nasa's body, even temporarily drawing out Nasa's soul, which caused Maiev's female subordinate to rapidly lose consciousness and collapse into a pool of blood.
Dealing with Nasa cleanly and decisively, before Illidan could even react, exposed far less information than if Arthas had entangled with Nasa for a while before subduing her.
Arthas temporarily did not want Illidan to know his identity, as this would reduce many unnecessary troubles. As for why he revived Nasa, that was also to avoid further complications.
Maiev valued her Wardens greatly; she regarded every Warden as family. For this female Night Elf, whose family members had died or gone missing, the Warden was her home.
Nasa and Maiev's relationship was even more extraordinary. Although Nasa referred to Maiev as "Mistress," even as master and servant, this was likely a bond spanning thousands, even tens of thousands, of years.
Just imagine, due to a duty, you are forced to endure darkness and emptiness for ten thousand years, and your only companion is your subordinate. In such an environment, you are each other's sole comfort. How close, then, would such a relationship be?
Just thinking about such a connection made Arthas's scalp tingle. He did not want to be relentlessly pursued by the madwoman Maiev just for killing a Warden's subordinate.
If Nasa had truly died, Maiev would undoubtedly be consumed by hatred and rage, capable of doing anything extreme. And her first target for pursuit would certainly be Illidan, who had escaped from prison.
Although Illidan was not the murderer of Nasa, in the eyes of the Wardens, he would certainly be implicated. And the current Illidan had not yet gained the power to transform him, he was on the Night Elves' own territory, and without the help of the Naga and Blood Elves, the likelihood of Illidan being caught would greatly increase.
As long as Nasa did not die, then even if Maiev was embarrassed and angered, she would not recklessly violate existing regulations. Given her respect for Malfurion, she would certainly go to him to report the matter.
The time spent in between would be more than just a day or two. One must know that Malfurion was still searching for traces of demons in Felwood. By the time Maiev's message reached him, Illidan might have already dealt with Tichondrius.
In this way, Illidan's escape would not only bring trouble to the demons but also make the Night Elves uneasy. The more unstable the Night Elves felt the situation was, the more likely they would be to seek outside help.
So, who could the Night Elves seek help from?
The Horde and they still had unsettled scores, and the Horde's own strength was not strong. Thrall and Grommash had also taken on the task of fighting Mannoroth and his army, and the Horde would certainly suffer a blow because of this. It would be even more impossible for the Night Elves to ally with the orcs; at most, out of respect for them having dealt with Mannoroth, they might temporarily put aside old grievances.
That is to say, in the end, the Night Elves could only lean towards the Alliance. As long as the Night Elves could be tied to the Alliance's war chariot, it could basically be declared that the Alliance would have the vast majority of say on both the Eastern Kingdoms and Kalimdor continents.
Only a sufficiently united and unified interior could gather the strength to withstand the full assault of the Burning Legion.
The current crisis, if calculated precisely, was merely Archimonde's hotheadedness, leading a small vanguard assault force to recklessly charge headfirst into the enemy's main base.
Archimonde trusted his own strength too much, and his endless craving for power had already overshadowed his reason, basically indicating that the scales of victory would inevitably tip towards Azeroth.
The Burning Legion's terrifying "starship fleets" and the core technologies they possessed were not demonstrated in this seemingly glorious, yet in reality farcical, surprise attack.
It can only be said that Archimonde's appearance, while causing the Night Elves to pay a heavy price, also made them realize the true terror of the Burning Legion.
Calling in the Alliance's army was because Arthas valued his enemies; he was unwilling to fight unprepared battles. But honestly, instead of spending effort dealing with Archimonde, this "reckless brute," it would be better to spend more time thinking about how to face the wrath of Kil'jaeden and Sargeras.
Ultimately, whatever Illidan wanted to do later was no longer Arthas's concern. He only needed to ensure that Illidan would stir the pot. He had other things to do, and keeping his distance from Illidan would also help him avoid contact with Maiev.
The "informant" in the valley told Arthas that a battle determining the fate of a race had already begun there.