Netherwing Eggs has a chance of dropping from all creatures and item nodes on the Netherwing Ledge, in the Netherwing Mines or at the Dragonmaw Fortress of Shadowmoon Valley with a very low drop rate of 1% or less. They can also be found on the ground tucked under crystal clusters, in mining carts, through mining Nethercite Deposit, and gathering herbs from Netherdust Bush. A recommended method of obtaining the eggs is by going in the mines, mining all the Nethercite ore and killing all the Blood of Draenor you can find. Finding the egg is guaranteed to go much faster.