Use ANY Grenade at UVH6 - Game On

Guns:

Maliwan Shotgun Stellium - with Shock (and potentially fire as secondary) with as high DoT as possible. Used with the Transfuser enhancement.

Jakobs Pistol Vial Launcher Underbarrel - This damage boost is great for min maxing. You can shoot the vial at the enemy then swap to the splash gun.

Ordnance:

This list is nowhere near complete as I am still experimenting with both legendaries and purples.

My go to roll is + chance to crit for Blackout uptime. Can also go + 1 charge, cooldown, nuke

Jelly - my go to for mobbing and bossing. Acts similar to Lightspeed from Borderlands 3

Blockbuster - great for mobbing if enemies are close together and insane for bossing if the enemy doesn't move much

Waterfall - lingering part is really good. Pulsing also pairs well with it

Swarm - lower damage but A LOT OF HITS

Jakobs Grenade - Crit part is a given but I also really like the Ricochet part for mobbing instead

Slippy - deals melee and ordnance damage which means you can add extra stuff for it

Firepot - deals both gun and ordnance damage. Use this build for specific build around this

Class Mod:

Passives are least important but look out for: ordnance crit chance, damage dealt, elemental damage

Grenadier - rolls points into Blackout

Icebringer - rolls points into Tail of the Comet

Cyborg - rolls points into Endless Bombardment but not as good as the above options

Repkit:

Triple Bypass - able to spam w/ a passive

Kill Spring - good for survivability. Also gives overshield

Get with Damage Dealt or Elemental Damage for min maxing damage that double dips. Ordnance Cooldown Rate is also good for passive cooldown while still spamming Tripwire

Shield:

Protean Cell - Go to for bossing. The shock bonus element applies to status effects where most bonus elements do not do this. So you will get 40% shock damage based on your Tail of the Comet, Blackout and Electrical Fire DoTs. It is VERY NOTICEABLE. Some weaker bosses might not need this. You also become a lot less tanky since damage goes directly to your health unless you have overshield

Firewerks - great for mobbing

Watts 4 Dinner - the bonus element is great for extra damage in mobbing

Enhancement:

Transfuser - when holding a maliwan gun with matching status effects to the enemy that dies will spread dots from ANY KILL but will take the card damage DoT of the gun being held. So if an enemy dies while it has a shock status effect then it will spread to other enemies near by but making the dot based on your Stellium. Not the status effect damage that was on the enemy that died. If you have a Shock/Fire Stellium and Shock and Fire DoTs on the enemy that dies then it will apply both DoTs. The enemy DOES NOT have to die from the DoT to spread.

You will also want the "Gun Splash Damage" passive as if you are holding a splash gun then it will count as Damage Dealt for most things. Gun Status Damage also applies to our DoTs applied here.

2/3 Gadget Ahoy - cooldown and damage is great

2/3 Get Throwin - splash radius helps more likely to hit enemies

1/3 Airstrike - more splash radius.

Other:

1/3 God Killer - damage will double dip. amazing for bossing. Can remove Get Throwin or Airstrike splash radius

1/3 Get Throwin 2/3 Airstrike - get more damage but less radius.

2/3 or 3/3 Skillcraft - applies to Tail of the Comet

Tripwire - allows for more Ordnance spam

Contamination - more status chance for Tail of the Comet

Fragmentation Payload - crit chance for Blackout

The Best Defense - damage boost will double dip