Seth knew that they should stop LeShanna soon just in case the Suggestion gets taken off of Toxic, holding his hand out. "Time for you to stop!" he said as he sent two beams of energy from his right hand straight at LeShanna, now visible again.
I'm on mobile now, I can't see if that first roll had advantage because you were invisible. Can you confirm if it did or not. If it didn't roll again with advantage, otherwise, the first attack misses, and the second attack will hit.
LeShanna, you take 9 damage and must make a Concentration check DC 10.