When a boss refuses to show up in PoE 2, the problem stops being theoretical fast, especially if your Path of Exile 2 Currency (https://www.u4gm.com/path-of-exile-2/currency) plan depends on steady progression and you're trying not to waste another evening on the same loop. That's why the Immured Fury fix in 0.5.4b matters: it doesn't add new rewards or change the fight itself, but it does clear up a progression block that could leave players stuck after doing the right thing and still getting nothing useful out of the run.
What the patch actually changed
The clean part here is simple. Immured Fury can now spawn any time after a player has completed 3 Corruption Nexuses. Before this fix, some players seemed to hit a dead end where the boss wouldn't appear properly, or the encounter didn't move their progression forward the way it should have. That's the kind of bug that feels extra annoying because it doesn't always look like a bug at first; sometimes you just assume the RNG was bad and keep grinding.
What I wish I'd known earlier is that this kind of issue can hide behind normal endgame pacing. If you've already finished the required Corruption Nexuses and Immured Fury still hasn't shown, the safest move now is to keep pushing more Nexuses instead of assuming the chain is broken forever. The fix means the encounter isn't permanently locked behind one missed attempt, which is a huge relief for anyone running a progression-focused loadout instead of just casually mapping.
Keep track of your Corruption Nexus completions so you don't lose count during a long session.
If Immured Fury does not appear after an attempt, continue with additional Corruption Nexuses instead of resetting your whole plan.
Don't assume a missing boss means your character is bugged; this was a spawn-condition issue, not a build problem.
Why players were getting confused
The frustrating part was the uncertainty. Community chatter suggested there may have been some hidden requirement tied to bosses or objective wording, and that confusion made people second-guess every step. That's a bad feeling in PoE 2 because players already deal with enough RNG in drops, loot timing, and upgrade pressure without wondering whether they misunderstood a quest trigger. For hardcore players, that uncertainty is a time sink; for casual players, it's the kind of thing that makes a session feel wasted.
Early progression versus later cleanup
In practical terms, this fix helps both early and late progression, but in different ways. Early on, players just want the boss to appear so they can keep momentum. Later, the value is more about cleanup: finishing missing points, unblocking a route, or recovering from a bad run without scrapping the whole chain. If your build is tuned for speed and stability, you'll feel the difference less in combat and more in pacing. Slow builds, on the other hand, benefit from not having to repeat entire stretches just to force one encounter back into rotation.
Style Pacing Boss Access
Fast mapping High Quick
Safer grind Steady Reliable
Mixed approach Flexible Repeatable
The table above is basically how I'd think about the situation in real play. Fast runners want the boss to pop without friction. Safer grinders want consistency more than speed. And mixed players just want the game to respect their time, which is fair enough.
Reward expectations and the safe read on the fix
There was also some chatter about reward drops, including talk of a Fracture Orb, but the patch information doesn't confirm any reward change. So I wouldn't read more into it than that. The only confirmed fix is the spawn condition. If Immured Fury is part of your regular progression route, the main practical takeaway is that the encounter should now behave more predictably after 3 Corruption Nexuses, and you can keep moving without feeling like one missed spawn ruined the whole night. For players checking market value and farming goals, that kind of consistency matters just as much as raw loot, especially when POE 2 Mirror of Kalandra (https://www.u4gm.com/path-of-exile-2/currency) is the sort of rare benchmark people still talk about when they compare endgame profit and chase items.