Shadowspawn

Shadowspawn was an Imperial Warlord whose forces fought the New Republic for control of the Inner Rim shortly after the Battle of Endor. He was eventually defeated by General Luke Skywalker's forces on the planet Mindor, with help from Mandalore Fenn Shysa and his Mandalorian Protectors. Lord Shadowspawn and his men fought to the last man, and this tragic loss of life finally convinced Skywalker to resign from the New Republic military.

Behind the scenes
For his article The Emperor's Pawns, Abel G. Peña had intended to make Shadowspawn be the same character as Blackhole, and Joe Corroney drew a picture of them as the same person. When that was rejected due to a background for Blackhole done by Pablo Hidalgo, the connection between the two was dropped.

For The New Essential Chronology, Dan Wallace gave Corroney's image of Blackhole/Shadowspawn to illustrator Tommy Lee Edwards, continuing the (at the least) visual similarity between the two. However, Peña has said he no longer considers them to be the same.