A Space Wolves warrior who has shown exceptional ability in close combat may be granted a wolf tooth necklace as a mark of his prowess. Models with a wolf tooth necklace always hit on a 3+ in close combat, even against opponents whose Weapon Skill is equal to or higher than their own.
Errata — Chapter Approved: Codex: Space Wolves clarifications (v1.0): If a model with a Wolf Tooth Necklace is fighting a Dire Avenger Exarch with the Defend power (the Necklace always lets you hit on 3+; Defend says opponents only hit on 6+), roll a D6 each round to determine which piece of wargear has priority. A Wolf Tooth Necklace has no effect on enemy vehicles without a Weapon Skill characteristic.