This build primarily meant to provide challenge in Warframe. So if you fan of inflicting 10 million damage on lvl-10 mob - you couldn't be in a more wrong place.
Nevertheless. Despite build requires follow several intricate mechanics to keep warframe alive, it rewarding in it's own way.

As weird as it might sound. It's actually easier to survive with this build on Steel Path. Primary focus is to be able consistently kill enemies below 40% health. And it's much easier then enemies not dying in one hit.
Duration is maxed out primarily for Dread Ward. The longer it last - the longer you can go without thinking on renewing it. However Roar benefits from long duration as well.
[Primed Flow] is used due to Bloodletting. It's much easier to replenish energy that way. One tap will replenish 320 energy. And the only requirement for that is to have health above 2 hit points.
The rest is just used for little bit extra strength for Roar. Although Seeking [Talons] slightly benefit from that too. I'll explain latter how Seeking [Talons] still can be useful in this build.

So, if it wasn't obvious, primary focus for this build is making you unkillable due to [Dread Ward] buff. That means using [Dread] Mirror on enemies that have 40% of their health+shield or less. That is also will be your only form of defense. Only one mod, and no arcanes for defense.
For the first kill it's most convenient to use operator. For which we will use nowadays meta - Unauri school.
Easiest it is to score first kill against Corpus. Just pop operator's #1 ability. That will drain them off shield, and automatically will make them on less than 40% of their health+shield value. Further using [Dread] Mirror against corpus generally means hitting specific target once or twice, and then use [Dread] Mirror on them.

Almost as easy it is to use against Grineer. For first kill just strip grineer off his armor with operator's #2. Then damage him to 40% health. Might be bit easier to do with amp that do continuous damage. Further kills against greener generally involves hitting them for one second, until first tick of bleed. That generally will put them bellow 40% health. Then use [Dread] Mirror on them.

Ironically hardest to use against infested. You can either use amp. Just careful not to kill them. Alternatively you can use Seeking Talons against them. Especially if used with Roar - they actually provide semi-decent bleed. It also make all targets stunned for few seconds. Which is handy.

Of course mistakes still can be made. For example you might think you have renewed [Dread Ward], but it wasn't. Or just got too distracted for too long and it expires. And of course on Steel Path it will take fracture of second to kill you without Dread Ward.
Nevertheless not all is over. Thanks to Unauri school you still can manage self-revive yourself by quick kills. Just don't forget to strip corpus off their shield, and grineer off their armor.

But generally when you about to star fight Lich/Sister or Acolyte. I recommend first to seek nearby mob and renew your Dread Ward. That way you will have 24 seconds to deal with them. Generally more than enough (or at least one stage of Lich/Sister). Same goes with map bosses.

Since we using Unauri, obviously we need to make sure our combo counter not gonna expire. Frankly it's easy to achieve with just Primary and Secondary Dexterity arcanes. Those alone provides +15 second. [Gladiator Rush] can give you another 6 seconds.

For companion choice it's recommended to have anything that restores you HP. No matter how small amount. As controversial as it might sound, you might want rarely move yourself from been on 2 hit points - just to be able to use Bloodletting. Albeit operator also can heal warframe. The only thing i would not recommend is wasting mod space on weapons for healing.