Unlike other survivors that have unlockable alternate abilities, Void Fiend's skills are altered by entering and leaving its Corrupted state.
For example, the Corrupted version of its Drown attack jumps from 300% to a chaotic 2000% while also losing some accuracy and range http://pbs.twimg.com/ext_tw_video_thumb/1518984549409210368/pu/img/B9G6kItS3O_yFGFA.jpg
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