Credit given Cheesy.

Named is pretty simple:

2 AoEs - Trauma based.
Riftwave - Minor damage, stuns those within 10m radius, dazes those outside of the 10m radius. Uncurable, about a 6s duration.
Protectors Strike - Hits roughly every 30s. High damage Trauma AoE. Basically a HP check on the raid. - Often occurs around same time as the Rift.

Strat - Start in a position. Roughly 10-15s into fight, he will cast a black circle/Rift on the floor. You will get a message saying similar to "A rift has appeared near you". You must move away from it swiftly to a distance away from the rift. Note; The rifts appearance doesn't do its radius justice, so move further than the animation for it.

30s Later, original rift disappears, a fresh one pops, move back to original spot.

There will be swarm adds that come into the fight every so often (2 pop spots, first left corner as you enter room, and the bottom of the far ramp). These are heroic based adds, which don't do much. Have an offtank pick them up and burn them.

tl;dr - Burn named, Survive AoE, Joust Rifts.

Nijea said the aoe is a 17m aoe. If you are bouncing around 18 meters, it would explain why some of your raiders are getting one shot. Probably because they are not paying attention to their distance if you are having everyone at 18 meters. Might want to be a bit further out when that when hits.

Protector's Strike - is that 1.2 mill hit "if within 17 meters" or "if outside 17 meters"? We've tried dancing around the 18 meter mark a good amount and still seem to have folks getting randomly one-shot by it.

Image attached of it - though not sure what "Any point not covered in the above effects" means since it's the first thing listed... (Unless the description is just upside-down and the daze should have been first..)

Spawns adds in 3 random locations, casts Riftwave (stuns 10m, power drains, 200k damage 10m, and 200k damage 200m - Does a 1.2 million aoe (Protectors Strike) if within 17m