Electric spider

An electric spider was a large type of spider that attacked with lightning bolts.

Combat
These large spiders were completely immune to lightning-based attacks. The preferred to seek out foes in narrow corridors, so they could send out a lightning bolt, hitting multiple foes. They also had no problem with the bolt bouncing back at them, as they could totally resist its effects.

Ecology
Electric spiders could sometimes be found in Leilon, Port Llast, and the Tower of Twilight. They were also known to dwell in the realm of Kalistes, as well as in the Underdark.