Apparently, the armor is so complex that it takes up energy.
If you set it to “white clothes” or make the character completely naked, it will generate smoothly.
Include these prompts at a minimum :
green skin, colored skin, red eyes, eyes highlight, no pupils, no sclera, blonde hair, rabbit ears, animal ears,
clothes:
purple armor, vambrace, red skirt, white pants, greaves, sledgehammer,
or
white clothes
Negative prompt:
dual wielding, multiple sledgehammer,