Arboreal Gulper

[Shammoz-terokkar (Shammoz)]

@Gnormous-silvermoon

You need to be 60

Quoting my reply on the support forum for others that may be interested here.

@Shammoz-terokkar

@Eadmaer-argent-dawn

Ill have to wait until 60.

Looking at the wowhead comments, players have found they can learn it once they hit 60. After that, all your characters level 45 and over can use it. It’s either a bug or just a missing tooltip.