A d'lis was a type of crystal found on Sullust, an Outer Rim planet that was the homeworld of the Sullustan species. The Sullustans found the crystals to be pretty and some female members of the species were named after them.
Behind the scenes
The d'lis crystals were first mentioned in the Galactic Campaign Guide, a 2003 sourcebook for Wizards of the Coast's Star Wars Roleplaying Game, written by Peter Schweighofer and J.D. Wiker. They were only described in a table of Sullustan female names.
- Galactic Campaign Guide (First mentioned)