Why did the Ascians never try to do these?

[Tsiron]

I have a "Why did the Ascians never try to do this" question of my own.

Namely, wait.

Pesky Warrior of Light is ruining all your plans?

Well, simply wait 100 years. You are eternal. He isn't.

Even if some Echo/Lifestream mumbo jumbo allows him to reincarnate, there will be a window of time where he would be a baby and you could carry out your convoluted plans unimpended.

I think it's in the other thread discussing Ascians but the answer folks here arrived at is that they can't really take it easy anymore, now that the knowledge of how to permanently kill them exists. And also an unhealthy amount of hubris, probably.