Tier 4 has a way of humbling people, even the ones who swear their build is "done." You walk in feeling set, maybe you've stocked up on Diablo 4 gold for upgrades, then Grigoire or Belial turns your run into a quick lesson. These fights aren't about flexing your tooltip DPS. They're about reading the room, knowing when to back off, and staying calm when the screen gets busy.

Grigoire is an add check, not a DPS race

With Grigoire, the biggest mistake is acting like the boss is the only problem. He loves to flood the arena with bodies, and if you let them pile up, you'll get boxed in and clipped by something you didn't even see. Deal with the adds early. Not "when you have time," but right away. A clean rotation helps: pull the pack together, lock them down, delete them, then go back to the boss. If your build can't do that, bring tools that can—stuns, slows, knockbacks, anything that buys space. And don't plant your feet. His zones punish greedy melee and lazy ranged players the same way.

Find safe damage windows and stop chasing uptime

You'll notice there are moments where Grigoire isn't pressuring you with a summon or a big cast. Those are the seconds that matter. Pop your burst, then reset. People die trying to "keep uptime" through bad ground or during messy add spawns. It's not worth it. If you're building for this fight, aim for a mix: enough damage to punish openings, enough toughness to survive a mistake. Because you will make one. Everyone does.

Belial turns the floor into the real boss

Belial feels different. Less swarmy, more suffocating. The poison damage ramps fast, and it forces movement even when you'd rather stand and channel. Then the darkness phases hit and your awareness drops off a cliff—vision gets worse, spacing gets tighter, and suddenly you're eating ticks while trying to re-find the boss. Keep your escape button ready for "Lustful Chaos." If you hesitate, it's usually a potion dump followed by a death anyway. In groups, roles start to matter: one player keeping steady pressure, another ready to peel or soak, and everyone calling out danger instead of sprinting in random directions.

Prep matters more than pride

These bosses are way less miserable when you show up prepared: upgraded glyphs, correct resistances, and elixirs you actually benefit from, not whatever's sitting in your stash. If you're still missing key pieces, it's often faster to sort your setup first—farm, trade, or grab what you need through reliable shops like U4GM so you can focus on learning mechanics instead of hoping your gear carries you.