He was also the illustrator for the well-known `` Xanth '' series by Piers Anthony , the `` Saga of Recluce '' series by L. E. Modesitt , Jr. and the `` Runelords '' series by David Farland as well as the original cover artist for Stephen R. Donaldson 's series `` The Chronicles of Thomas Covenant the Unbeliever '' .
He also illustrated covers for the popular `` Xanth '' series by Piers Anthony , the `` Saga of Recluce '' by L. E. Modesitt , Jr. and the `` Runelords '' series by David Farland . Sweet painted the original cover art for Stephen R. Donaldson 's series `` The Chronicles of Thomas Covenant the Unbeliever '' .