Lascer first appeared in the article "Sentinels of the Shoal" in Dragon #297 (July 2002), by James Jacobs. Lascer received a full description in the "Demonomicon of Iggwilv: Apocrypha" edition in Dragon #359 (2007).
Lascer appears as a 9-foot tall emaciated humanoid with twin rapiers wired into his hands, and shards of broken glass piercing his feet. His mouth is filled with needle-like teeth, and although a wound from groin to gullet has been stitched shut, tiny spidery legs probe out from the wound on occasion.
He was a human planar explorer who discovered the Abyssal layer of Obox-ob, who captured him on his second visit and transformed Lascer into a tanar'ri minion, originally using him as a spy and now as an assassin.
Lascer is an active rival to Dagon, although he poses little threat to the Lord of the Depths.