I know that Krillin's Selflessness State is technically canon already in the DBS anime, but there was little that this form had to offer imo.
However, thanks to @sweetescapeartist for his Tumblr post, I was able to understand the form and like how it tied to Krillin's journey as a character.
It's thanks to the post that I was able to come up with new abilities for SS. So without further ado, here's my version of Selfnessness State.
"By facing his fears, controlling his heart, and learning to perfectly control his ki to the point that none of it leaks out of him, Krillin is able to significantly increase his strength, gaining a layered, focused, white aura outline around his body with his six dots glowing."
With Selflessness State, Krillin is able to utilize his ki without draining it significantly, allowing him to unleash high-level physical/energy attacks without any drawbacks to the point that even basic attacks have high damage.
Krillin is also capable of altering the property of his ki for a variety of uses: making it sharp like his Destructo Disc for offensive methods, using it to help heal himself or his party, or layering it around his body to make it be like armor.
In this form, Krillin’s form makes him more durable than he is normally, making him able to contend with his opponent, even if they are stronger than him.
2 transformations/power-ups down, one more to go.