Solo 2 Phase Ecthar, The Shield of Savathûn

This is an extremely tight 2 phase. It took me about 20 hours of testing/practice to get it, but I think I can get it somewhat consistently now with all the things I've learned. This run is super slow as I wasted a lot of time farming for mountaintop ammo and moving heavy bricks, as well as messing up my sunbracers rotation, but I think a sub 6 minute is very doable (with good heavy rng). As a reference I have been practicing this encounter a fair bit and my fastest 3 phase is around 8:30, so even with a lot of time waste the 2 phase is well worth it for a speedrun.

Strategy:
In order to two phase in the way that I did, the most important thing is getting off 23 GOOD shots of acrius. When I say good, I mean you need to be hitting every pellet, and also trying to get as much headshot damage as possible. In order to have 23 shots, you need a heavy brick placed in a spot where you can pick it up after (at least) 4 shots of acrius. The way I like to do this is by moving a heavy brick with mountaintop to the edge of the boss pool closest to where the rally banner is, but having it offset to the left or the right so you don't accidently pick up the brick immediately (this run actually has a good example of both spots).

Once you place the final vestige of light, you need to immediately run to where the well keeper knight spawns, I do this by jumping onto the staircase and quickly jump-boost Icarus dashing to convert my momentum (refer to the video), then you need to kill this knight AS QUICKLY as possible. Even if you time everything frame perfectly you have less than a second of wiggle room for the whole phase, so killing this knight fast is crucial. I use a high impact fusion rifle with liquid coils, major spec, reservoir burst as well as triple surge mods and radiant. This is just enough to kill the knight in a single burst if he doesn't spawn with a moth shield, and if he does I just have to melee him after the burst. You can use a shotgun or different fusion but you want to try and get the knight finisherable basically instantly.

Once you finish the knight, hip fire arbalest to break the bosses shield and throw a nade at his feet, then cast well. Well placement is pretty important, you want to put it at the base of the staircase as this will (usually) prompt the boss to use a titan barricade, which seems to make him just stand still for like 10 seconds. While in well animation swap to acrius/necrotic loadout and go to town. You want to use the same rotation I did, which is: melee, shoot, reload, shoot, reload, shoot, melee, making sure you melee as soon as each 3rd shot goes off. The last 5 shots you will need to reload before shooting but that's about the only variation in the rotation for the whole phase. After I shoot my 23rd shot I try to quickly swap to an arc rapid fire shotgun to get a little extra damage off, but this is not needed and most of the time the boss will be immune by the time I swap anyway.

Loadouts:
I use sunbracers for the ad clear section, felwinters to apply a debuff when finishing the well keeper knight, and necrotic grips for extra dps:
Sunbracers: https://dim.gg/fxfvbdy/ecthar-1
Felwinters: https://dim.gg/3afa7qi/ecthar-2
Necrotics: https://dim.gg/ksuykpq/ecthar-3

If you have questions put them in the comments, I will try to answer them as quickly as I can. This run I recorded off stream, but my first 2 phase I got on stream at:   / bog_on_my_dog  , if you liked the vid come hang out, I do challenges like this and will be starting solo flawless speedruns of this very soon (Once I two phase final boss).

Huge props to Biggz:    / @biggz342   for getting this done a couple of hours before me, we were both collaborating on how this could be made easier but I definitely got most of my optimizations from watching his runs.