That didn't take long. Blizzard's rolling out a hotfix to stop an exploit that made Diablo III's Wizard class invincible.
There's a note on the company's forum about it.
"We are currently rolling out a hotfix for a recent bug regarding invulnerable Wizards," said the firm.
"We will continue to carefully monitor this issue and welcome anyone with information about bugs or hacks to submit a detailed report to our Hacks Team by emailing firstname.lastname@example.org, or by completing the Hacks Report web form. In your correspondence, please include any steps necessary to replicate the issue as well as any additional details you are able to provide."
It was reported yesterday that a little jiggery pokery could render your Wizard godlike. Never more.