Senahde, Caster of the Deep, is a Unique Abyssal Caller found in Tidal Cave Level 1 beneath the Greyhollow Island in Act V of Diablo III.
She spawns for an unmarked event if player touches her two idols that may randomly appear in the cave.
In combat, she has Thunderstorm, Plagued and Electrified affixes, and attacks with a horde of Abyssal Protectors.
Senahde's idols