The fal'dorei are a race of former elves found in Suramar. Many years ago, exiles from Suramar City came to Falanaar. Valewalker Farodin took pity on them and gifted them with an arcan'dor tree. For a time it sustained them and they were safe, but it did not last forever. The arcan'dor became unstable and died, and in a flash of wild magic the elves were twisted into spider-like creatures, becoming the fal'dorei. Now they live in the tunnels beneath Falanaar and were after the arcan'dor seed protected by Farodin. The fal'dorei intended to use its power to return to the surface.
The fal'dorei use the same skeleton and animations as two nerubian models.
The fal'dorei are likely inspired by the driders, a race of half-spiders from Dungeons & Dragons that were originally drow (dark elves). Like the fal'dorei, the driders live underground; in their case, in the Underdark.