Dragon heartstring is a powerful wand with a lot of magical “heft”. It is not the core you want for subtlety, but for sheer power it is definitely the best. Although it is the most common core among Dark Wizards, Dark Wizards are most certainly not their most common users. Dragon heartstrings are by far the most common wand core amongst Slytherins, but their power often bonds to Gryffindors and Ravenclaws as well. However, they tend to overwhelm the archetypal Hufflepuff personality.