I have a new character (less than a month old) I'm looking to erase a spell. I wanted to confirm what the cost would be to do erase my first spell at the library. Elanthipedia makes me believe that there would be no coin or tdp charge, but then I got to reading old posts in this forum and people were saying that it would be cheaper to just by a new spell slot.
Ask me how fun it is to have Eagle's Cry and Devitalize as two of my four spell slots. That's what I get for assuming that learned spells would be the best way to learn Targeted Magic.