The Test of Skulls, Somnus is a level 60 quest (available from level 55) for Horde in Dustwallow Marsh. It is step 10 of 14 in the quest chain “Onyxia attunement (Horde)”. This quest has no item reward; it is part of the chain.
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HC This also applies to Anniversary Hardcore, which still plays Classic.
Warlord Goretooth's Command
The Skull of Somnusfrom Somnus Elite · Swamp of Sorrows 74.1 / 68.3