Roar, Eclipse, and [Xata]'s Whisper allow your warframe to push out a lot of damage as long as you build to each ability's strength. We run Roar here because we have the armor stripping and/or slash procs to completely decimate enemies even though Roar is nerfed as a subsumed ability.

This build also works with hybrid defensive/offensive options like Elemental Ward or Warcry. Smite and Shock unfortunately have issues because multiple element buffs do not meld very well on some builds and can cause you to have very weird element combinations. There really isn't room for the augments.

[Brief Respite] allows [Grendel] to get a significant portion of his shields back, making his shield gates last longer. You can abuse this even further by running a Decaying Dragon Key.

Range is low but we have to keep it just a bit above the minimum or we won't have the range to eat any enemies with Feast.

[Natural Talent] helps your abilities to feel more fluid. It synergizes with several aspects of the kit including [Brief Respite] and Feast spam.

Arcane [Guardian] is a flex arcane that increases your survivability in general content. It can be replaced with any other arcane to suit your playstyle.