Hex

Current Hex variants and how to get them:

Compy - Tome of Hex: Compy : Sold by Flamesmith Lanying in the Shaman Legion Class Order Hall.
Cockroach - Tome of Hex: Cockroach : Sold by Cravitz Lorent, a rare spawn vendor in the Broken Isles Dalaran Underbelly.
Spider - Tome of Hex: Spider : Chance at dropping from boss Nal'tira in The Arcway dungeon, on mythic or heroic difficulty.
Skeletal Hatchling - Tome of Skeletal Hatchling : Chance at dropping from boss Rezan in Atal’Dazar dungeon, any difficulty.
Zandalari Tendonripper [Horde only] - [url=https://www.wowhead.com/item=162623/tome-of-hex-zandalari-tendonripper[]Tome of Hex: Zandalari Tendonripper : Sold at Zandalari Empire faction Revered reputation by Natal'hakata in Dazar'alor.
Wicker Mongrel [Alliance only] - Tome of Hex: Wicker Mongrel : Sold at Order of Embers faction Revered reputation by Quartermaster Alcorn in Drustvar.
Living Honey - Tome of Living Honey : Chance at dropping daily from the Honey Smasher, a Rare Elite in Stormsong Valley.
Snake - Tome of Hex: Snake : This tome has been datamined from the game files but does not seem to be obtainable by players.

All tomes currently require character level 41 to learn and bind on pickup to the character obtaining them.