The provided article text does not contain any actual content from the piece on Halo: Campaign Evolved Skull locations — only PC Gamer's website navigation, membership promotions and sign-up prompts were captured, likely due to a paywall or page-loading issue. As a result, no factual details about the game, its Skulls, or their locations can be summarised.

To provide an accurate, neutral summary, the full article text would need to be retrieved, ideally by accessing the page directly or via an alternative source that isn't blocked by subscription prompts.