This LoRA adjusts the thickness of the main and detail lines of the illustration.
Increasing the LoRA value will make the lines thicker.

Please use it in the range from 0 up to 2 for best results.

Model: Works on illustriousXL models
LoRA weight: from 0 to 2

Note: You may be able to achieve a similar effect in your prompt by using "black outline", but I thought it would be worth sharing this LoRA anyway.