Neil Jackson. The sad side of e-books is that covers are mostly thumbnail propositions.
The original mass market paperback's art was nice, but this really makes me shudder.
Get Gnelfs via the banner at right for the Kindle. It's a few pennies more but available in multiple formats at Smashwords.
It's about the title characters but also features dueling sorcerers, or OK one bad sorcerer and one mysterious occult investigator and dark trails.