Wands are only as powerful as the wizards who use them. Some wizards just like to boast that theirs are bigger and better than other people's.
J. K. RowlingDementors are among the foulest creatures that walk this earth. They infest the darkest, filthiest places, they glory in decay and despair, they drain peace, hope, and happiness out of the air around them. Even Muggles feel their presence, though they can’t see them. Get too near a Dementor and every good feeling, every happy memory will be sucked out of you. If it can, the Dementor will feed on you long enough to reduce you to something like itself — soul-less and evil. You’ll be left with nothing but the worst experiences of your life.
J. K. RowlingAnd as she jogged out of sight, they could hear her muttering, "Tentacula. Devil's Snare. And Snargaluff pods. Yes, I'd like to see Death Eaters fighting those.
J. K. Rowling