Let's compile a list of what the different Essence Runes give at each specific level, much like TheTitan has done.
I'm assuming that if the level 1 rune gives 15 then level 2 will have 30, 3 45 etc, but let's see how it goes.

Here's a table of the required level, AP and materials for each essence rune level.

-- Original posted on forum.cabalonline.com by twiztaa