Fist of Cenarius

The Fist of Cenarius is a two-handed mace that gives a bonus to magical power and chance to critical hit with spells.

Source
The Fist of Cenarius is a quest reward from the quest Champion's Battlegear which starts with Vargus in the Cenarion Hold in Silithus. To complete the quest, you must turn the following items to Vargus:
 * 15 Cenarion Combat Badge
 * 20 Cenarion Logistics Badge
 * 20 Cenarion Tactical Badge
 * 1 Mark of Cenarius

You must also be with the Cenarion Circle.