Originally Posted by
Nephys
Sylvanas burns the tree because she has to, she knows that the Horde doesn't have the numbers to defeat the Alliance, she needs to use other weapons, she realizes that the attack on Darkshore wasn't enough to break their spirits, only a true act of horror will be enough, so she burns the tree. She also needs the Alliance to be angry enough to attack Undercity and fall into her trap. And she needs to "look good" to the other members of the Horde, she needs their support and she knows that N'Zoth will try to turn the Horde against her. After the attack on the Frostwolves the Horde wants blood.
Thanks for your coments! I'm glad you like my ideas!
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Its obvious that Sylvanas needs a major trap to kill Malfurion, he is probably one of the strongest NPC's at the time, he was able to clear the Nightmare from Cenarius, a feat thought impossible before, but Tyrande is nowhere near as strong as Malfurion. If you use Warcraft 3 as a comparison let me tell you that Tyrande didn't gain any power up since then, as Malfurion was in the Dream until Cataclysm if I'm not mistaken, and it is confirmed that since he spent so long in the Dream he gained tremendous power.
Nathanos is far stronger than most people think, before Legion he was already stronger than any Dark Ranger even with his deteriorating body, but the power up that he received in order to fight the Legion made him possibly one of the stronger characters on the Horde. He is pretty much a Death Knight, and for reference, the Death Knight player had the power to enter into the Ruby Dragonshrine and kill every single red dragon in there, probably without breaking a sweat. Nathanos was already exceedingly strong for a human, now imagine that powered up. I don't mean that Tyrande is much weaker than that, but my money would be on Nathanos.
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If you look at real stories more often than not intel cannot be verified to 100%, people have to make the best decision based on the information available. After Legion people were worried about Azerite and the sword on Silithus, no one was expecting N'Zoth to strike with manipulations, and even if they were its not easy to completely verify the intel. In my story Turalyon goes there in person to verify the reports, that's as much as can be expected. Also most races are still living in a medieval sort of time, its not like in the real world where we have so much experience with this kinda stuff, and even so mistakes happen often.