Hey all! I hope you're enjoying Tahiti!
I've been a cap fan since the game was live, even before his 52 rework! Now with the TBUE update (updates are in orange) cap can handle all content with the same ease as most of the roster! This is my serum build, I also have a deflect build that is 7-10%ish behind on damage, but it is much more tanky.

 

Rotation/Priority:

Aim for having 10 serum for each serum power! Additional notes are at the bottom of the guide for running different builds with the 3rd talent row. All of the talents were pretty close, but this build worked the best for me.

• Use  off cooldown to proc our row 5 talent.
• Hold left click to build serum with 

• Once you have 10 serum use  to apply vulnerability

• Use  once you hit 10 serum

•  to gain 5 serum followed by  once you hit 10 serum. Follow that up with  to get your DoT rolling.

 

 

 

Alternative Gear Choices:

Slot 1: -->  --> 
• Skrull hammer and vibro aren't far behind a fragment in terms of damage, but fragment has more of a defensive benefit added in. Vibro are ranked lower since skrull hammer is much easier to roll well.

Slot 2: -->  --> 
• The cosmic option here will outperform the other options. The grind can be annoying, but we want those crits! Aim for CSR>BSR with Crit damage and Brut damage on a might cosmic.

TBUE Update: An omega slot 2 with CHR/CDR/BDR/? will take the lead spot.
Slot 3: --> 
• Cap's own slot 3 is an excellent source of stats with crit and brut rating on top.

Slot 4:  -->  --> 
• Cap's own unique has a good amount of raw damage (and spirit sustain), but the procs don't quite function as worded so we'd opt for the crit/brut rating. Two of the slot 4s have attack speed as well, which doesn't help much when we're so far into diminishing returns. The skrull uniform will make a considerable difference over the other options.

Slot 5:  --> 
• Cobra is right on par with an octobot. They are both an improvement over cap's slot 5. Cap's slot 5 is still pretty good, but the other 2 options are better. Using Cobra hood would unlock other skill options to replace Airborne Assault. It's great for clearing, but the animation time is longer and it can be subject to animation cancelling. Shield toss would be a good filler since it returns fairly quickly where bounce can go out to Narnia before returning and delays your Torqued Shield Throw. 

Ring:   BSR+ STR/CDR-->  --> 

TBUE Update: An Omega ring (with similar stats) will take the lead here

Artifacts:  >  >  >  > 

Medals:  are all decent options.

Legendary: i80 if you want a boost to your defenses, but it comes at a heavy toll to your damage.
 is the i70 option

 

Infinity points:

1.) TIme Gem - Temporal Loophole 38 points

2.) Mind Gem - Mental Focus 150 points 

3.) Power Gem - Strike Through 75 points

4.) Soul Gem - Fighting 6 points

Now that some +1 attirbute bonuses are unlocked, feel free to dump points into:

• Mind over matter (6) in Mind Gem

• Show of Force (50)  and Superhuman (6) in Power Gem

• Dump the rest into Fighting (in Soul Gem) with straggler points into Potency (in Reality Gem)

 

Additional notes:

• You'll want spirit on hit with your catalyst for enough spirit sustain. If you only have medkit, consider running Cap's Boondocker boots for slot 4.

TBUE Update-

• If you prefer the old build's flow (using shield slam, instead of shield toss) simply use 3:3 and use Airbourne Assault and Shield slam with 4 serum, while using the full 10 for your sig and Torqued Shield Throw. In the same manner, you could use 3:2 while giving Shield Toss the same priority as you would Shield Slam. The damage difference on a cosmic dummy was only a few seconds on average.
• Cap want's to stack as much crit/brut rating as possible. There arn't many hits going out, so we need those hits to count! If you choose to spend infinity points make sure it's at .6 increments since the system rounds up! A partial percentage as .6 will net you the same gain as a full 1% so don't waste those precious IP!
• Cap's row 5 talent takes us a mile into diminishing returns with attack speed. Stacking additional attack speed is very low priority for this reason. The idea of stacking up serum faster sounds great, but the diminishing returns past 30% are brutal (pun intended). So we stack brutal rating instead!

• Try to only use Vibranium bash immediately following Airboune Assault. There is an odd timing with AA and it's animation can clip your next ability. If this is to happen, let it be the least damaging ability. TBUE fixed!

• The serum power damage bonus on our slot 5 can be consumed by procced damage. Try to limit items that proc random damage! This goes for other gear, artifacts, infinity points, insignias ect.

• The damage bonus on our slot 4 cannot be procced by AA. Meteor kick has a 50% proc chance, and I think charge, leap, and backflip around a 30% chance. I wouldn't go too far out of your way to proc it, but if you notice Meteor Kick didn't proc it (it will be the icon for AA in your buffs), don't be afraid to charge out and back in after your Torqued Shield Throw!

• Despite the tooltip's info, Shield Bash does NOT scale off of Deflect rating. It will give you false info if you have serum saying that it's damage has been incresed by X amount of Deflect rating. This is a known bug going back to Gaz. No need to go out of your way stacking deflect rating in this build. It still helps, but only on defense. TBUE fixed!

• This build is great for starting out, but the NoSerum may have better performance once you have 500-600+ IP. Use the same gear but swap to talents 1:2 (Heroic Strike) and 4:3 (Stabilized Serum) and use Shield Strike (Heroic Strike if spirit issues) for your filler, instead of Vibranium Bash. The rotation is simply hold left click and keep everything on cooldown! It's a much smoother and enjoyable playstyle, once you have the IP.

• Cap's slot 5 will perform better in NoSerum, but it's a little annoying to properly utilize the serum proc. When your serum powers come off cooldown, let go of Heroic Strike/Shield Strike and use your serum powers one after another. The proc will grant damage rating to your next ability, but that can be consumed by anything, including damage procs. So we want to buff our harder hitting abilities. Once you cycle through your serum powers, resume Heroic Strike/Shield Strike.