Agashem appears to be a leader among the Grimtotem tribe of tauren, as he or she is the one who orders them to destroy the Shady Rest Inn.
You find this out by reading the 
[Grimtotem Battle Plan].
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This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
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However, Agashem could simply be an near-anagram of "Magasha," which is suspiciously close to "Magatha," the leader of the Grimtotem.