Progenitus

Progenitus is a rare elite saurok located in Ihgaluk Crag on the Isle of Thunder.

Strategy
Get out of both areas of effect, which are marked by red circles. If hit by either AoE, the knockback will send slow-moving enemies off of the cliff he resides on. Otherwise, move quickly as he will refresh his Evolution buff, gaining another stack and +10% damage dealt, every 25 seconds or so.

Achievements

 * Champions of Lei Shen

Reputation

 * +100 The Black Prince

Speculation
It's possible that Progenitus was the first saurok created by the mogu, judging by his name and title.