Patch 7.2 added several new Warlock Pet glyphs and we're looking at how to get them!
Glyph of the Shadow Succubus
There's a succubus standing near Tehd Shoemaker. She's called Syaith. If you're a scribe and /kiss her, you'll get Technique: Glyph of the Shadow Succubus. The trick is she only appears during the World Quest "Where There is a Whip...". You don't need to have Broken Shore World Quests unlocked to get it according to many reports from redditors that were able to find her.
|Credits go to redditor Sonotmethen|
Here are some tips from redditors!
It seems you don't even need to be max level or have Inscription maxed out to get the pattern.
Glyph of the Fel Succubus
Technique: Glyph of the Fel Succubus seems to be a random drop from Cathedral of Eternal Night.
The current version of the Fel Succubus is bugged (thanks to @Plaguestorm for pointing out), which results in a much weaker version of the regular Succubus pet in terms of damage output. It's advised not to use it until the issues get hotfixed.
Glyph of Wrathguard
Technique: Glyph of WrathguardTechnique: Glyph of Wrathguard can be purchased from the Armies of Legionfall Quartermaster Warmage Kath'leen for 2,500 Nethershards.