'Purging the Corruption' is proving impossible to complete. There are zero corrupted mobs spawning in Old Commonlands. The obliteration summoners won't transform them and dragging them through the purple smoke yourself isn't working like the comments on Alla say.
Here is a good place to post this type of stuff. http://everquest.allakhazam.com/db/quest.html?quest=4712 is a link to the quest for reference. Unfortunately I couldn't say if it is broken or not and I am not home to check!
You can always submit issues to the issue tracker: https://dgcissuetracker.com/ Just know that it's not managed by Daybreak Games, so you'll need to create a separate account there. It's also recommended that you don't use the same credentials as the ones you use here. You can also post issues in the bug threads located here in the Test Update Notes and Bug Roundup section: https://forums.daybreakgames.com/eq/index.php?forums/test-update-notes-and-bug-roundup.10/