The wording on Zader is poor. They use "expire" to mean whenever it goes away, as opposed to naturally.
As mentioned here, essentially, with a zVader lead, dots landed are permanent as long as zVader is in play, no matter how you lose them, they will reapply
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It says regain on expiration. Not regain on a dispel or cleanse skill....
As mentioned here, essentially, with a zVader lead, dots landed are permanent as long as zVader is in play, no matter how you lose them, they will reapply