Sekto
Species: Octigi (related to the Glukkon species)
Reason for draining river: He runs a Bottled Water company.
Reasons for killing Steefs: I'm not sure. Status could play a factor, since I take it Steef heads are like deer heads or antlers, people hunt the Steef for those parts of them, and being rare could be why they're so coveted.
Vengence could be another one, or a grudge. Perhapse Sekto's family got the shit stomped out of them by a Steef, and Sekto wants revenge.
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