Obtain Invincible from Arthas in Icecrown Citadel.

Obtain a Red Qiraji Resonating Crystal.

Owner of Amani War Bear.

Obtain The Horseman's Reins from The Headless Horseman in the Scarlet Monastery during Hallow's End.

Obtain an epic Brewfest mount.

Obtain Mimiron's Head from 25-player Yogg-Saron with no Keepers assisting you.