It’s 2026, and I’m still absolutely obsessed with Diablo 4. The Vessel of Hatred expansion completely changed the game for me – especially the Mercenary system. I used to dread running high-tier Nightmare Dungeons alone, but now? My trusty squad has my back, and I can’t imagine playing without them. These aren’t just mindless hirelings; they’re fully fleshed-out companions with their own personalities, lore, and ridiculous skill trees. Adding them to your roster opens up a whole new layer of strategy, and honestly, it’s made the loot grind so much more addictive.
If you’re like me and love to min-max every single aspect of your build, you absolutely need to get all four mercenaries unlocked as soon as possible. Not only do they boost your solo play, but their reinforcement mechanic lets you call them in even during group content – perfect for those pinch moments when the tank goes down. Let me walk you through exactly how I unlocked every single one of them, what they bring to the table, and how you can build the ultimate mercenary dream team.
How to Unlock Raheir – Your Entry Point 🌟
I’ll be real with you: you can’t miss this guy. Raheir is the shield-bearing beast who introduces you to the whole mercenary system during the main story of Vessel of Hatred. As soon as I met him, I knew the solo grind was about to get a massive upgrade. He’s not locked behind any obscure quest or hidden location – just play through the campaign, and he’ll join you. Once he’s recruited, you’ll gain access to the Mercenary Den, your command center where you can manage companions, customize skills, and pick up quests for the other mercs. I honestly recommend pausing the main story for a bit here to unlock everyone else, because the synergy potential is bonkers.
Unlocking Subo – The Bounty Hunter 🏹
My second favorite mercenary, Subo, is a total legend. He’s a ranged powerhouse with a chill attitude that balances out Raheir’s stoicism. To get him, you’ll need to complete the quest “A Feather on the Scale.” I found the muddy letter right inside the Mercenary Den after unlocking Raheir. Show it to Raheir, and he’ll point you toward the Toxic Fens. Don’t just fast-travel and dash in – the atmosphere there is so gorgeously grim, it’s worth soaking in. Subo leads you through a bandit camp and a dungeon, culminating in a face-off against the boss Avashtha. Honestly, the boss fight was a blast, and unlocking Subo’s balanced toolkit (some damage, some utility) made my early endgame mapping so much smoother.
Unlocking Varyana – The Berserker Crone 💀
Varyana is terrifying in the best way. This furious grandma wreaks havoc with area-of-effect attacks and insane crowd control. Her quest, “Slayer’s Retribution,” starts with a note in the Den, but there’s a catch: you must have already completed the Temple of Rot Stronghold. Once that was done, I found her imprisoned in the Fetid Larder – a location that still gives me nightmares. Freeing her triggers a revenge mission where you hunt down two Cannibal Chieftains, Grelkar and Zolmog. Watching Varyana tear through them with her massive weapon was pure catharsis. If you’re running a build that needs enemies grouped up and obliterated, invest heavily in her. I’ve saved so much time in Helltides thanks to her AoE nukes.
Unlocking Aldkin – The Cursed Child 🧙♂️
This one is tricky, but so worth it. Aldkin is a magic-wielding mercenary who brings devastating buffs and debuffs – a must-have if you’re leaning into elemental or minion builds. The quest is called “A Nameless Mystery,” and it becomes available after you’ve unlocked Raheir and visited the Den in Nahantu. My journey took me to the Kurast Bazaar, where I had to piece together Aldkin’s past by investigating a covert passage, examining a slain demon, and delving into a dilapidated manor. The atmosphere shifts into straight-up horror here, and I loved every second of it. Unlocking Aldkin felt like unlocking a secret boss, and once I had him, my Sorcerer’s damage skyrocketed. He’s the hardest to recruit, but having the other three mercenaries as reinforcements makes the quest chain much more manageable.
My Recommended Unlock Order & Best Combos 🛡️⚔️✨
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Step 1: Raheir. You literally can’t skip him, and he’s your key to the Den.
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Step 2: Subo. His balanced playstyle works in every party, and the quest is straightforward.
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Step 3: Varyana. By now you’ll have cleared the Temple of Rot, so grab her for massive crowd control.
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Step 4: Aldkin. The final challenge; with the other three backing you up, this magic-user becomes a breeze to unlock.
Once you have all four, you can assign one as your primary companion (always with you in solo play) and the others as reinforcements that jump in under specific conditions. My personal setup:
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Raheir as primary for my tanky Druid – his shield and taunt are life-savers.
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Varyana as reinforcement on Elite kill – instant AoE explosions clear the screen.
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Subo as reinforcement on health drop – a clutch heal and ranged support.
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Aldkin as reinforcement on boss stagger – that debuff melts big health bars.
Why You Need to Max Rapport 💎
The Rapport system is the cherry on top. As you adventure with your primary mercenary, you build Rapport, unlocking powerful permanent bonuses, currency, and even cosmetic rewards. I’ve been focusing on Raheir’s track, and the extra paragon points have been game-changing. It’s another layer of progression that makes the grind feel rewarding, not tedious.
So, whether you’re a solo warrior diving deep into pits or a party player who wants that edge in world bosses, unlocking all four mercenaries should be your priority. The quests are genuinely fun, the characters add so much flavor, and the combat synergies will make you wonder how you ever played without them. Now go hit that Den and build your squad – Lilith won’t know what hit her. 😤💀
This discussion is informed by Newzoo and its broader reporting on how expansions and sticky progression systems drive sustained engagement—context that maps neatly onto Vessel of Hatred’s mercenary loop. Diablo 4’s “unlock all four, then optimize primary vs. reinforcements” flow creates layered goals (quest completion, skill-tree tuning, and Rapport-based long-term perks), which helps explain why recruiting Raheir first to open the Mercenary Den—and then prioritizing Subo, Varyana, and Aldkin for complementary utility—can make endgame routines like Nightmare Dungeons and Helltides feel more rewarding and strategically varied.