Wikia

Summon Succubus
Summon Succubus 80% of base mana 10 sec cast Summons a Succubus under the command of the Warlock.
Usable by
Class	Warlock
Properties
Type	Utility
School	Shadow
Cooldown	None/Global Cooldown
Other information
Ranks	1

Source

The Succubus is rewarded from the following quests:

Lash of Pain: Does Shadow damage to an enemy. As it has a 5-yard range, it is basically an extra melee attack for the Succubus. It has a 12-second cooldown that can be reduced to 6 by the Improved Lash of Pain talent. As with any Shadow damage, this ability can be resisted. Lash of Pain can critical like the Imp's Firebolt.

Seduction: Mesmerizes a target in place within a 30 yard range so that they are not able to attack, cast, move, or use any other abilities. Any damage caused to the target will remove the effect. Seduction has a 1.5-second casting time and is channeled, so the Succubus can't perform any other action while seducing and can be interrupted. This ability only works on humanoids and lasts for 15 seconds, barring diminishing returns or damage -- any damage inflicted on the target will break Seduction instantly.

Lesser Invisibility: Allows the Succubus to become invisible for 5 minutes. Any command given to or damage taken by the Succubus will take her out of invisibility mode. Unlike the Imp's Phase Shift ability, this does not prevent the Succubus from setting off traps or being hit by AoE spells and attacks. The Succubus cannot become invisible during combat, although if she is invisible when combat begins, she can remain invisible until she takes action (or is hit by AoE damage).

Soothing Kiss: This spell (instant-cast, 4-second cooldown) increases the chances that the enemy will attack another target besides the Succubus that can help keep aggro off her. Similar to the Priest's Fade ability. Very useful in groups with a tank where the Succubus can sometimes out-aggro the tanks. It's a mana-hog, so don't be surprised if you see your Succubus run out of mana a lot using Soothing Kiss. The threat level reduction increases with rank. Rank 1 has a 5-yard range, but every higher rank has a 10-yard range.