Outbreak Perfected can be debated because of the weapon technically being a modified warmind gun with SIVA, but Sleeper Simulant TOTALLY counts as a warmind weapon and should be able to generate warmind cells. Sleeper kinda sucks right now, so this would be an easy and cool way to make it better.
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Could help keep Warmind mods relevant since all those weapons are being sunset soon, unless Bungie thinks cells are too much fun and therefore have to go bye bye for good...