The Talisman of Evasion causes attacks against the wearer to miss 15% of the time. Does not stack with Evasion or Drunken Brawler.
Arthas can find one in The Culling, chapter 6 of the Warcraft III human campaign, The Scourge of Lordaeron.
Cairne Bloodhoof can find one in The Oracle, chapter 7 of the orc campaign, The Invasion of Kalimdor.
Tyrande and Maiev can find one in Shards of the Alliance, chapter 6 of the Frozen Throne sentinels campaign, Terror of the Tides.
In the Frozen Throne the tooltip was changed to add: or Drunken Brawler.