I finally managed to make the closest equivalent to what used to be one of my favorite brushes in ibis: the onion's brush.
Since it has a softer stroke, density and faded tips, it's works very well for shading and lighting, specially if you like a smoother look without looking like a completely solid shadow or light:



While you can use it however you want, since this was made for coloring specifically, I can't guarentee a good result but here is how the lines look:

