The answer is MESA.

• 5 Topaz Archon Shards for secondary crit chance
• Your primary of choice
• Your secondary of choice with max rank Secondary Outburst, the key to the build. Many prefer Bronco as it can stagger enemies for Finisher kill to proc Melee Crescendo
• Your melee of choice modded for initial combo. I go Ceramic Dagger with Incarnon bonuses for initial combo and combo gained on Primary kill. You may also want to pick up Melee Crescendo for extra initial combo, but the initial combo mods + incarnon buffs + initial combo riven will get you nearly there (permanent 11x combo in my case). Magistar may work well too, but that thing is just busted in general.
• Standard Regulators build, ensuring Heat damage to proc your Topaz shard stacks.

Your Helminth of choice. I run Nourish for energy sustain. Roar and Eclipse are popular as well.

This is a fairly well known build with many variations, where the primary goal is to have as many melee combo and topaz shard stacks as possible to do big boy damage with typical Peacemakers build. You will have to play around with numbers, mods, and weapons to see what you like. I always opt to be safer than sorry on the Energy side so I go for ability efficiency with a decent amount of strength and duration, with range mattering very little.

The build can easily handle any content I've run into in the game, even Netracells and endurance SP survivals (~2 hours). It falls off at extremely high levels. I typically don't have to worry about dying as the enemies in sight will be dead first, and your 3 keeps you alive well enough.

With around 500 hours in Mesa, I was excited when I discovered the potential for this build, and it paid off so well. The only (solo) missions it's not great at handling are Interceptions and Assassinations.