Shalistra Mejanusi

Drow goddess of the Dead Servants, New Moon, Darkness, and Truth. She has some control and association with Undeath and Undead animals, insects, and vermin.

Her domain of the Dead Servants isn't just about undeath and the undead. It is also sometimes about spirits. It can in some cases even seem to refer to other "dead" servants like some golems and even in some cases constructs. It seems to be a fairly wide scope for a domain none other have claimed.

Her domains of the New Moon and Darkness while similar do cover different areas. For one the New Moon also covers obscured light and things brought out of illumination. This is less about undiscovered and more about obscurity.

She has always been a goddess of Truth. Her sister is Memory and some wonder who is the third sister if any and what does she represent. 

She is the sister of Feyla Zenda Hyrun and Eilistraee

She is believed to be dead, having been killed by the Word. This is all a ruse but to what end? This is now learned to have been false. After the assassination attempt she was hidden, locked away, and forgotten so that the Word word think her gone. This would then let him move forward and then they can undo his plans as they become known.

She is not always worshiped by evil or just dark elves. There are still some elves who worship her. Usually in her less evil areas especially in regard to the Truth domain.

Symbol: A female dark elf form on a field with a new moon circle behind or an undead praying mantis fighting an undead cat
Weapon: Hand crossbows, hook swords, or the kpinga 
Animal: Undead insects, animals, and vermin
Colors: Black, Gray, and purple, sometimes a maroon