More to find out at https://www.blueboxgoblin.co.uk/
And another tree.This one's a bit creepy.See printing note below.
Don't forget to rescale it. At least 100mm should work well with 28mm miniatures - especially if you want to see skulls.
0.1-0.15mm; 10-25% infill, 2-3 perimeters.
It should work without supports.