This is my personal build with my own Riven. Paired with the new Cascadia Flare Arcane for a massive additional damage boost. Combined with a Warframe Helminth Subsume of [Rhino]'s Roar to increase faction damage for further scaled damage output. I experimented with Exilus Slot [Lethal Momentum] and [Ruinous Extension] to increase the distance and beam length seems to pass through enemies over [Lethal Momentum]'s additional projectile speed. It is important to note that the [Catabolyst] can headshot as well for additional damage even though with recent updates other weapons like the [Catabolyst] lost the ability to land headshots. Lastly, I prefer to scale the weapon damage further with subsumed [Rhino] Roar for additional faction damage.