NCF – Extended list of Neutral creatures.

It's funny, I also couldn't open the manual the first time I tried to figure it out, I thought it was some kind of useless thing - an unfamiliar format, it opens in Explorer XD

I haven't dealt with Alpha and other things, I create icons in paint.net, the process is similar:
1) I combine the icon, cut out a square, remove the background, by the way, a pink background is good, but I take screenshots at the edge of the map and crop the sky.
2) I reduce it to 256 pixels.
3) I create a copy of the layer - now we have 2 identical icons on top of each other, the bottom one needs to be processed through "hue" and "saturation" - it should become super black.
4) I blur the black layer with a Gaussian blur of 3 pixels, copy it and merge it until the transparency disappears - a black outline of 3 or 4 pixels without alpha appears around the icon.
5) I merge the layers and reduce the image to 128 pixels, draw an outline around the edge - it's ready.