MonkeezOnFire
Adventurer
Heighten is good if you plan to take the single target big damage spells like Disintegrate or Finger of Death. At the level you are casting those sacrificing a 3rd level spell slot to give your biggest spells a bit of an edge isn't a hard pill to swallow. I do wish heighten had the option to give disadvantage to multiple targets though. Maybe 3 points + 1 or 2 points beyond the first disadvantage.I don't know about Heighten at 10th... it's ok but expensive. Again more for builds that are focused on getting people to fail saves (hold person, charm, web, etc) more than blasting.