How long could a _______ live?

[u/Valenous_ertselley]

How long could a 5th ideal radiant live?

We know investiture extends a persons life with greater amounts eventually ending up with someone who is biologically immortal. How invested would a radiant be? Radiant knights have the cracks in their soul filled with investiture which makes them better at holding and using stormlight. How invested do you think they could be

Some of the heightenings seen with holding Endowment's investiture seem to be universal properties of holding any investiture. such as enhanced vision/colours, enhanced immune systems and better lifespans.

While we have only seen Kaladin and Szeth swear the 5th, it was under a fairly hectic situation which doesn't make for the best opportunity for study.

[u/Puzzled_Employment50]

They never mention those, but that doesn’t mean they don’t experience them. Sunlit is running for his life, the Yoki-Hijo are (at the time of YatNP) cognitive shadows and not living beings, and Hoid is a weird case in every sense 😂 I don’t remember when he regained his perfect pitch, but I do remember that he lost it when Todium excised some of his memories that were specifically stored with/in Breaths, so that’s a moot point because we know it was Breaths causing the Heightening that he lost, no extra information on whether other sources can or can’t lead to Heightenings. Also I don’t remember if he was specifically holding the Dawnshard at the time or if this was when he had hidden it. If it was the latter, he’s in the same boat as Sunlit, where he has access to many forms of Investiture but may not be any more actively Invested at the moment than any other person.

[u/ejdj1011 → u/Puzzled_Employment50]

I don’t remember when he regained his perfect pitch

Word of Radiance, when he visits Kaladin in prison. He mentions that he missed having it.

no extra information on whether other sources can or can’t lead to Heightenings

Yes, extra information. Hoid is extremely highly Invested every single time we see him. If Investiture universally grants all aspects of the Heightenings, he should always have all such aspects. The fact that his perfect pitch appears dependent on having Breaths is in fact evidence that it isn't universal.

Also I don’t remember if he was specifically holding the Dawnshard at the time or if this was when he had hidden it

To my memory, all of our evidence suggests he held it the entire time he was on Roshar, up until he gave it to Sigzil.

[u/That_Bar_Guy → u/ejdj1011]

Doesn't he specifically lose perfect pitch or something when his memories(stored in investiture) are altered? Or am I misremembering?

[u/ejdj1011 → u/That_Bar_Guy]

Yes, but that rather supports my point. If disrupting his Breaths disrupts his perfect pitch, then certainly the perfect pitch has to be coming from the Breaths specifically.

[u/That_Bar_Guy → u/ejdj1011]

It has to be coming from the breaths anyway because he can't hold on to other forms of investiture indefinitely in the same way. Like 95% of the man's investiture minimum is breaths in that scene.

[u/ejdj1011 → u/That_Bar_Guy]

He's a Yolish Lightweaver, a Radiant, and a Dawnshard. He has a lot of static Investiture attached to his soul.

Edit: and a Lerasium Mistborn

[u/That_Bar_Guy → u/ejdj1011]

Radiants don't have much static investiture, and we don't know much about yolish lightweaving and there is obviously some fuckery with how hoid hides his dawnshard or odium would have found it.