Welcome to Librarium Online!
i'm new to eldar and i'm wondering what is a craftworld and what does it do that makes a different force
well if you see a deer scream for mercy from god
if you see a snake smile and say hello
A craftworld in most blatant terms, is one of the giant world-ships that have comprised the remnanats of the Eldar civilization since the birth of Slaanesh, and the opening of the Eye of Terror. In terms of the game, a craftworld is a sect or variation of the eldar. They are all still eldar, and have much the same choices as the eldar, but they have variant rules. Best way to look at the eldar is in terms of an analogy. The eldar defined in the Codex: Eldar are much the same as the "vanilla" codex chapters of the Space Marines. They are the basis for most of the eldar forces that you will see on the game board. The Craftworld Eldar (i.e. Saim-Hann, Biel-Tan, Ulthwe, Alaitoc, etc) are much like the divergent chapters of Space Marines (Space Wolves, Blood Angels, Dark Angels, etc) in that they both have rules that make them different from the more basis sects of the same army.