For the weapon to use with this build, see my [Rubico Prime] build.

Basically, with the new focus changes, Zenurik has an ability which lets you use a free ability every 60 seconds. Which means if an ability has a duration longer than 60 seconds (preferably at least 5 seconds over 60 seconds so the ability has enough time to refresh and give you a safe recast window) you can essentially keep that ability going for free. Which means you can completely forgo efficiency, [Flow] mods, and even arcane energize.

Use empower first, then activate [Energy Conversion]; At that point switch to operator and activate hardened wellspring. This will give you a total of 478% ability strength, at which point you activate Vex Armor.

At this point you obviously need to build up the fury buff, and you only need a total of 850% to one-shot the limb of a level 50 Eidolon Teralyst with my rubico build (with no sniper combo needed).

With the level 55 Eidolon Gantulyst, you will be able to one-shot a limb at max [Fury] buff.

You will need two shots at max [Fury] buff for a limb of the Eidolon Hydrolyst.

This is all assuming you don't get an orange crit of course, (which is a 14% chance), and that you're running solo; If you have others running [Corrosive Projection] or buffing you it's possible to remove some ability strength for other mods (such as [Vitality]) or replacing [Power Drift] for [Coaction Drift].

If you run [Shattering Impact] you can replace [Corrosive Projection] too.