Increasing The Strength Of Your Breaths

[Trusk'our he/him]

I was wondering about Navani mixing Investitures with different Intents when I had a thought; what if you were to mix Bio-Chromatic Breaths with some other investiture, and then retrieve the end result? You might have to worry about the end Investiture not being retrievable, but maybe you could command the Breaths to Invest a Gemstone with the explicit instructions to return to you. Perhaps that would work.

It also might be interesting to see if the resulting Breaths would alter the effects of your Heightenings, as they would no longer be composed of Endowment's Intent, but at least you would have more total Investiture in your system.

[Honorless he/him]

I wonder if there's anything cultivation-y you could learn to do with Investiture. I mean "cultivation" as in Xianxia, not the Shard Cultivation. Passive effects like the Heightenings can't be all that simply having a lot of Investiture gives you, right? Invested Arts that you can simply learn and use any Investiture for, no need for any Connections, nothing external with inherent properties like metals needed. Maybe something like the Tzai blows?

[Green Hoodie Mistborn he/him]

I wonder about the base question though. 

What would mixing Investiture of different Intents look like for Shards who are not invested in the Roshar system? I know Vasher can power his need for investiture with Stormlight, but he can't Awaken with it. 

I have kind of assumed that the mixing Navani does is because those Shards are invested in the Roshar system overall. 

Breaths don't require any Connection, but I wonder if there is a way to take unkeyed Investiture to Awaken in some way? Man it would certainly make research so much easier for Awakening if you could unkey Stormlight and fuel your research with it instead of Breaths