Lygrass was a werewolf sailor mentioned in Death at Sea.

After visiting the insane sailor Gustaf Joannhes, Sliske tracked down Lygrass, the last surviving member of the Glory of Zaros, who was drinking in a bar by himself. Sliske interrogated him about what happened aboard the Glory, but he was reluctant to give answers. When asked about Xau-Tak, Lygrass started singing a song that resulted in a bar fight, during which he was killed.