iron
...that, in mythology, iron is often associated with blood, or used as a protective or lucky charm?
...that, in <a class="mw-redirect" href="./Mythology" id="mwBdg" rel="mw:WikiLink" title="Mythology">mythology</a>, <b id="mwBdk"><a class="mw-redirect" href="./Iron_in_mythology" id="mwBdo" rel="mw:WikiLink" title="Iron in mythology">iron</a></b> is often associated with <a href="./Blood" id="mwBds" rel="mw:WikiLink" title="Blood">blood</a>, or used as a protective or lucky <a href="./Amulet" id="mwBdw" rel="mw:WikiLink" title="Amulet">charm</a>?