A tier 6 wildstalker helmet is a helmet that keeps track of the amount of kills in the Wilderness of the wearer. Players may claim one from Mr Ex after 5000 kills.
This is the highest level wildstalker helmet and cannot be upgraded further by clicking the Change-look option.
Like all Wildstalker helmets past Tier 1, it has a brag and a transform emote, which have the same basic concepts as the emotes for the Duellist's caps, with the skulls appearing for the brag after Tier 3.
While this can be wielded and interacted with in a non-member's server, it will only count your PvP kills in a member's only server.