Dave, please forward your request to the Support Team: http://support-portal.plarium.com/ticketcreator/throne/en?devicelocale=en&spGame=throne-web

They will check the issue🙏

> Has the Teacher Rune been disontinued ? I do not see it in the storeroom anymore 

I still see them, e.g. Devotee and Adviser.

I have had same happen, with gems too, when I use them all up. (Pretty rare, you have to have exactly the right number for a whole number of legendary, then apply them to gear.)

If you go into rune workshop, you can use the drop down to deselect all and select training - you won't see anything listed if you don't have any.

[They must still be present, or you wouldn't see the training 'category' in the drop down list.]

You correctly pointed out that if the training category is visible in the dropdown list within the rune workshop, it indicates that training runes, including the Teacher Rune, are still present in the game. wordle 

Teacher Rune is no longer manufactured or distributed. This is something that often happens with technology products cookie clicker , especially when the manufacturer decides not to continue developing or supporting the product.