What the Eck? is a achievement in Heroic mode Gundrak. It is part of the meta-achievement, which in turn rewards the [Reins of the Red Proto-Drake]. To complete this achievement you must defeat Gal'darah, the last boss of Gundrak, in Heroic mode while still under the effects of Eck Residue. Eck Residue is a cosmetic buff obtained when you are hit with the attack Eck Spit by the Heroic-only Gundrak boss Eck the Ferocious. The Eck Residue buff lasts for one hour or until death.