<!> THIS BUILD IS UNFINISHED <!>

[Terminal Velocity] is my goto exilus. Not only for it's projectile speed, but also for the falloff boost. (which practically means more damage)
I really can't seem to find out about any other arcane than Fractalized Reset. You can go for Primary Deadhed, by finding some enemies (at some camp) and head shotting them to get stacks.

Fractalized Reset: Will be a general help... From my experience, I am guessing the most of the most, reloads their weapon after firing up Eclipse & [Shock Trooper] buffs. This will make it faster :D

This build typically uses [Amalgam Serration]. If you don't feel like getting your hands on it, it's totally fine going with the regular [Serration]. (Even I don't have maxed out [Amalgam Serration], so I'm using [Serration] myself)
[Split Chamber], obviously for extra multishot, bringing us at a 90% chance of shooting 2 bullets.
With the use of [Argon Scope], we can hit our eidolon in the head to give ourselves a great CC increase.
Self explanatory mods:

[Vile Acceleration] (Fire Rate, because we [Hate] charging for so long). [Hellfire] (We need heat, obviously to create radiation, which is known to be the best damage type, against an eidolon). [Critical Delay] and [Vital Sense] (Giving us a delicious taste of Critical Stats~). [Stormbringer] (Just for the extra bit of damage, as Lanka uses electricity already).

For people wanting to use Primary Deadhead, switch the following mods:

• Split Chamber > Galvanized Chamber
• [Argon Scope] > [Galvanized Scope]

Here's a small guide to Primary Deadhead:

First of all we will forget about our external triggers, such as galvanized mods. The reason for this is because we proc them all at once, when/if triggering Primary Deadhead.
Find any camp and attempt to headshot at least once on an enemy... This should give you:

• Primary Deadhead: 24s ((120/240/360)% Dmg. Mainly 120%)
• Galvanized Scope: 12s (120+(40/80/120/160/200)% CC. Mainly +160%)
• Galvanized Chamber: 20s (pre 80%+(30/60/90/120/150) MS. Mainly +110%)
  1 Headshot kill; 120% Dmg, 160% CC, 110% MS.
  But since not everyone wants to go through doing headshots... it is not required, at all. (It could be just incase someone isn't running a dps frame)

Notes: (Changes that might work for some)

• Primed Chamber, instead of Argon Scope.
• As for a riven, I am not sure, but for now I am trying to get a riven with +fr, -zoom and/or projectile speed. Will (probably) update this page if I have found myself one.