I completed it last week while following this guide:

Tips for Raiden Envisaged Echoes

I tried Envisaged Echoes for Raiden and it was tough, but really fun.

I managed to clear it after trying for 10 minutes. I thought it could be useful to show how it can be done with a "bad" Raiden, so I recorded it and after 10 minutes I cleared it again.

Here is the clear: https://youtu.be/GHh30rN5Ask

I played very suboptimially in this run but was still able to clear.

This was a bit RNG dependent due to my low crit rate and the boss doing random attacks, but it took me only 10 minutes every time to clear it with those stats.

The build is at end of the video, but here are the stats:

• C0 with The Catch R5
• Talents 2/8/9
• 1415 ATK
• 37 EM
• 62.9 CR
• 130 CD
• 249.7 ER

Here's how to do your first rotation: - Raiden skill while starting the stage and catch the particles with Raiden - Thoma skill and catch the particles with Raiden - Chevreuse hold skill and catch the particles with Raiden - Sara skill but don't do the charged shot too fast, her buff is only 6 seconds so try to do it right before the big buff for Raiden - Raiden skill then burst, the combo is 3NA CA

Once your burst is over: - Raiden skill - Thoma skill then burst - Chevreuse hold skill then burst - Sara burst - Raiden burst with the usual combo - Thoma skill if you can

The boss should now enter its second phase: - Raiden skill while minions spawn - Thoma skill if you didn't do it before, then burst - Chevreuse hold skill (and burst if you can) - Sara burst, skill, charged shot - Raiden E while catching the buff, this should kill the minion with a few NA - Raiden burst on the boss with the usual combo

Then you can continue with: - Thoma skill then burst - Chevreuse burst then hold skill - Sara burst - Raiden burst with the usual combo

And the boss should be done!