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Erach, The Dunethrasher, is a superunique Lacuni that sometimes appears in the centre of the Stinging Winds (map). The area is littered with corpses and very nearby is a Resplendent Chest. When you first open the chest a couple of Lacuni Warriors will appear, one either side of you. After they're disposed of the chest is yours for the taking.

Stat Normal Nightmare Hell Inferno
[[]] (db) Level
[[]] [[]] XP 0 0 0 0
HP 0 0 0 0

Erach also possesses Mortar and Molten modifiers and appears with a bunch of Lacuni Huntresses.