We kill it in the corner near the port spot (the hidden corner). You lose a little time with the knockback, but gain a little by not having to run to the water. For us, the gain in time by not running is greater than the loss from knockback.
I've seen it killed both ways, what works for some may not work for others.
The knockback can cause too much of a problem with dps. if you drag him to the water from where he spawns you can have uninterrupted dps burn of the adds and the named. The time from when you run to the water to when the trauma goes off is 10 seconds or so. Plenty of time to get your 10-12 meters.
Tank water mob right against the wall on the left to minimise knockback. When ported run back to wall and reposition.
Regulus AOE's
-Thunderous Tremor
-Shockwave
-Rockslide
Regulas AOE's
-Whirlpool
-Pressure Wave
-Tidal Wave
--------------
Merged Post
--------------
Also Arcane Vexing every 40 seconds is the cursing one
Strategy Updated