As this needs to go out to way more people, here are the basic steps to beat the event. For now, without Valkyries or any secrets.
1st arena (eye of magnus)
- the key is to interact with all the rods/pylons immediately
- once all went down, destroy the crystal
2nd arena (britaheim)
- there are 4 bubbles, each shielding 1 echo
- each bubble has a pressure plate near by
- 1 person steps on the plate, the other collects the echo
- you need those 4 echoes in order to unlock the 5th echo
- the 5th is located under water in the back of the arena
- use 2 echoes to lower the barrier
- the other 2 to lower the shield inside the cave and reveal the 5th echo
- then collect the 3 echoes inside, get out of the cave and pass the barrier
- then remove the 2 echoes you used for the barrier
- now use all 5 echoes in the arena and destroy the crystal
3rd arena (forge)
- there are 4 relics, 2 on each side
- a barrier guards those relics
- pick up relic, wait for barrier to go down
- wait on the next barrier
- place relic
- after all 4 are placed, destroy crystal
4th arena (Diana’s landing)
- kill stuff
- kill more stuff
- kill even more
- once the Riftmaster spawns, kill it
- interact with two marked panels
- destroy crystal
5th Arena (Castle Kelrik)
- grab the only two orbs that are available from the beginning
- match their symbols to the ones that appear above one of the two doors with the barriers, a light above the barrier will turn green when you placed the orb correctly
- pick up the orb behind the barriers
- repeat the two steps above for the remaining barrier
- once you have all four Orbs, bring them to the central structure and match its symbols to lower the shield protecting the crystal
- destroy crystal
6th Arena (Crucible of Astrid)
- grab the only available echo near the tunnel/airlock straight ahead
- use it to activate the laser on the ledge
- this will make 4 additional echoes available right to where the laser hit
- so you should have 5 in total now when removing the one from the laser again
- back to the tunnel/airlock, two players with a total of 4 echoes step into the first section and wait in front of the barrier
- the player with the 5th echo stays outside and uses the echo to unlock the barrier inside the tunnel and to automatically activate the barrier at the tunnel entrance
- now the two players inside the tunnel are able to advance to the device inside the cave
- use the 4 echoes to activate the pressure plates
- now step on the 4 pressure plates (it’s possible to activate all 4 plates with 2 players if they are quick enough)
- this activates a beam that destroys all barriers and ultimately exposes two panels
- interact with the first panel on the rock to expose the crystal to destroy it
7th Arena (Sea of Takaro)
- you need to deliver 3 echoes upwards the waterfall in the center of the arena in order to expose the crystal
- pressure plates are located in the West, North and East of the arena
- teammates need to stand on the pressure plates in order to lower the barriers. alternatively you can use a weight on those pressure plates
- collect the echoes, swim upwards the waterfall to deliver the echoes
- destroy crystal
After the arenas, it’s time to explore and collect points.
But you are better off with a YT video on this -> Cataclysm – Video containing the majority of secrets
Last, you kill Vara.
Her attacks are pretty easy to avoid.
I guess the only attacks that gives people trouble are those walls of fire.
Simply do what she tells you: get to her and stay in the lit area.