Create circles of hell as you unleash your Fusion Strike, Sentient Wrath and Spectrorage to create Blasting Zones of pure destruction.

Mod Breakdown:

-[Brief Respite]
Your standard Shieldgate Aura mod. Caliban's Shields are 131.25 with the Decaying Dragon Key, which makes it feasible to Shieldgate with any ability cast.

-[Blind Rage], [Transient Fortitude]
These are two of the strongest Ability Strength Mods the game can offer, and we'll need both along with Molt Augmented or Molt [Vigor] (your preference which you want in the open Arcane slot; this is why the slot is blank) to hit our 200+% breakpoint with Fusion Strike.

-[Overextended], [Stretch], [Augur Reach]
At 265% Range, we nearly cap out on how far our abilities can work for us. Fusion Strike will generate a 26.5m explosion that will draw enemies into its center, as well as leave a layer of fallout for a brief period of time. Spectrorage will [Reach] a fraction over 21m with its [Charm] radius, which easily covers a significant chunk of land in the blast. Sentient Wrath reaches nearly 59m away, which will mean a lengthy cooldown before recasting, but allow for some decent crowd control over a larger expanse. Note: With Brief Respite, Augur Reach, and the two Augur Pistol mods on your Secondary or Sentinel, every ability will give you Shieldgate.

-[Spectrosiphon], [Primed Flow], Arcane Energize, [Streamline]
[Caliban] is an energy hungry Warframe with a small reserve. By casting Fusion Strike, and then following up with Spectrorage, we can improve the efficiency of spawning Energy Orb significantly as more enemies will be clustered inside, and with Energize we can regain a larger chunk from the resulting drops. Streamline will help offset part of Blind Rage 's negative, while still letting us Shieldgate effortlessly off all abilities.

-[Primed Sure Footed]
You'll most likely use AoE weapons. This will keep you from knocking yourself on your bottom. Also helpful against other outside forces that would like to inflict Knockdown on you.

-Archon Shards
There's a bit of variety that can help Caliban with this build, so I'll list some beneficial choices below:

Casting Speed -- always a plus, especially for his 4.
Ability Strength -- a single Shard for this would put you at 204%, so you don't need to use a Molt Arcane.
Ability Duration -- this would help all of your abilities by a few extra seconds. Not a high priority, unless you just want to get back to neutral levels, or if you get some Tauforged Shards you can use the extra Duration to replace Streamline with Fleeting Expertise, offsetting the negative.
Effectiveness of Energy Orbs -- you could double/triple/quadruple how much Energy you get back per Orb; this could potentially eliminate the need for Arcane Energize (for those of you missing this Arcane and not seeking to buy/farm it, consider this top priority option).
Energy Max -- when you're a glutton for Energy, you need a bigger reserve.