User blog comment:Ccg08/Assassin's Guild: Boethia vs Mephala/@comment-4113369-20120606191026

Well, according to the lore Mephala taught the chimer the arts of stealth and assassination. That would be a pretty good reason, no? Besides, Mephala's "hat" is secrecy/obscurity, pretty fitting for the patron of an assassin's guild. Finally, I think Boethiah has a certain dramatic flare to him/her, what with the tournament hosting and everything. The shrine restoration in Morrowind also comes to mind. The definition of the word is "to murder by sudden or secret attack". Boethiah's kind of assassination is exclusively the former, methinks.

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Actually, now that I think about it, the first time Boethiah actually acts like the lord of assassination and deceit was during his/her quest in Skyrim, wasn't it?