His most impactful accomplishment? How could anyone even begin to rank them? Albus Dumbledore had done a lot of things. Olly carefully read over the list, some of which he'd already known but some of it was completely new to him. His defeat of Grindewald had definitely had a great impact on the wizarding world, otherwise who knows what else the dark wizard could have done? But was it the greatest thing Dumbledore had ever done? Finally Olly settled on something and raised his hand. "I think one of the most important things he did was create the Order of the Phoenix. Without them Voldemort would probably have been even more powerful and done more damage and even been in power longer. But we can't say for sure someone else wouldn't have founded it if Dumbledore hadn't."