One spell (Explosion!) as she might have, make no mistake, Megumin is the greatest Arch Wizard. She's also the best waifu of all. Satania is a close second, though.
The main page shows a dynamically loaded set of images featuring, well, Megumin -- no surprises there alright. The list of images are fetched via either Dan- or Gel- booru's API, and each links back there.
Err, don't know what else to write here, really... "Have a nice day," maybe?