How can I run Diablo II on Mac OS X 10.7 (Lion)?
Solution 1:
Barring an update from Blizzard that seems, to be frank, incredibly unlikely, The only way to play Diablo II on your Mac is to run an older operating system. Either natively, such as Windows via Boot Camp, or simply having an install of 10.6 on another partition, or through virtualization software like VMWare or Parallels.
Sorry to be the bearer of bad news.