Minor Craftworlds which we might have some common ground with and are not very far:
- Lugganth: Renegades/outcastes who want to take their craftworld into the webway. Close to the Harlequins. Segmentum Obscurus.
- Il'Kaithe: Known for creative Bonesingers, Located in the Segmentum Obscurus. Very anti-chaos.
- Iybraesil: Near the eye of terror. Very anti-chaos. Focused on Spelunking Crone World for Spirit Stones and pre-fall secrets/tech.
-Yme-loc: Segmentum Obscurus, Expert weapon smiths, with a focus on Titans and Engines of Vaul.
Yme-Loc uses the symbol of the Crucible of Souls as its world-rune. For the Eldar of Yme-Loc, the symbol represents the belief that the fate of their race is still theirs to forge.
These are potentially allies, IMO.
More distant minor craftworlds, less likely to become allies though...
- Mymeara: Sneaky craftworld, that managed to hide itself in the Segmentum solar, apparently by bending space around it. Had trouble with Orks after the fall.
-Thuyela: Location unknown, Destroyed and Pillaged by the Space wolves 3rd Company in the Great Crusade. Location Unknown.
-Varantha: Militant chaos haters, known for gemcraft and metalwork. Located in Segmentum Pacificus.
- Malan'tai: Trouble with Orks post Fall. Eventually allies with Iyanden and has a good run. Ultima Segmentum, probably. Notably fortified craftworld.
Major Craftworlds diplomacy:
Ulthwe: Focused on Chaos and the survival of the Eldar species. Having ELDRAD ULTHRAN on side is probably a very good idea. Their low number of aspect warriors makes our tech something they might want for their Black Guardians.
Iyanden: Wants a resurgent Eldar Dominion, and believes that the resurgence will starts at the maiden worlds. Focused on keeping the maiden worlds unspoiled by Chaos. Pioneered the Infinity Circuits. Not as stupid as Biel-tan about revanchism. We can probably curry some favor with them by purging orks and chaos from nearby worlds.
Alaitoc: Focused on the Necrons. We probably worsened the relations with them by showing Respect to the Necrons. Eventually become the most puritanical followers of the Eldar Paths, suspicious of even the other Eldar. Currently hostile
.