Is the last boss still bugged? I've been going at it for 2 hours and not once I've seen it open its chest...I'm pretty sure I'm doing the right thing. I was able to get its health down to maybe 70% but it cost me a few ammo boxes and took quite a long time. There must be something wrong with it...
I don't think they've acknowledged the bug that's been discussed across various forums and websites about the chest never opening.
However, they are currently overhauling that boss' mechanics and the new fight should roll out in the next patch (though I don't think they ever specified an ETA).
My understanding is that, currently, the DPS window (after you return with DPS buff stacks from the nether realm) is a random number of seconds between 15 - 30, and that for the chest to open, at least 10% of the boss' health must be done in that 15-30 second window.
From what was mentioned by one of the devs in this thread, they're going double the boss' health pool, lock the DPS window to around 30 seconds, and reduce the damage you need to inflict to open the chest to 3.5% (which at double health, translates to 7%, still lower than the current 10%). The idea behind this new version of the boss is that the stagger will happen way more consistently, and stupid-high (and stupid-fun) damage numbers should be happening after pretty much every nether realm sequence (as long as you exit the portal with a good number of damage buff stacks). They're aiming for a much more consistent fight with a lot less RNG; right now the worst of which is that the DPS window can swing wildly from 15 to 30 seconds.
Presumably, if there is indeed a glitch that prevents the chest from opening, it'll be discovered and fixed during this overhaul.
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