It is said the Eladrin are most like the elves before the breaking atoned to arcane magic and living in the Feywild. However many Eladrin still hold resentments against elves for leaving the Feywild. However Eladrin had settled all over of the seasonal groves of the Feywild before the Lunar Crisis as well has having a major settlement in the The Astral Sea city of Sha-Lai.
Following the Lunar Crisis and Spud's reign around a thousand Eladrin returned from the Astral Sea to help build the Feywild.
Some Eladrin Settlements that are known after crisis, The Cerulean Keep, and Whitestone
When Eladrin die their bodies turn into flowers rather than decaying
Like elves once an Eladrin comes of ages they appear that age until there death.