Warband Map to Everywhere All At Once

So, um... what is this, exactly? I mean, I know what it does (reveals maps which your Warband has explored)... but I've noticed when I log into my alts I keep find this spell randomly having been placed on their Action Bars. Yet when I go into the Spellbook, Warband Map to Everywhere All At Once is not listed there anywhere, whether under the Class tab or the General tab (unless I'm totally blind?)...

...and it's not a toy, because I checked and there's nothing in the Toys collection that matches this spell; though the original version of this spell was a toy -- rather, it was a series of toys called Scouting Maps (e.g. [item=187869], [item=150743], and [item=150744]), all of which were unfortunately made obsolete by the introduction of this mysterious spell.

I ask because I've removed this spell from the Action Bars of several of my alts already, not having used the spell first... so there's currently (to my knowledge) no way to get the spell back in order to use it on those alts -- which I'm not upset about, but I find really strange.

Edit: Oh, wow, yup, I'm blind. Warband Map to Everywhere All At Once is listed in a caret / triangle expandable spell slot called "Warbands" under the General tab. The "Warbands" expandable caret slot uses the Warbands campfire icon, and when you expand it, currently it expands to show 2 spells: Warband Map to Everywhere All At Once and Warband Bank Distance Inhibitor.

Just so you know this requires you to level two DIFFERENT classes to 80. I had 4 different level 80 druids before I found out this spell existed. Now I have to go level something else.....

This does not grant exploration of Kezan or the Lost Isles.