A rare dungeon reward is getting attention for the worst possible reason
Diablo 4 players are flagging a new frustration around the Mythic Prankster dungeon setup: a fresh April 3 bug report says a player used their first-ever Mythic Prankster key, found the goblin inside, and then watched it become effectively untouchable before it vanished, taking the reward with it. The forum post describes the goblin as taking no damage at all for a few seconds and then disappearing, leaving the player with no mythic payout and no key.
That is a nasty little bug story because the hook is brutally simple. This is not some common overworld goblin that slipped away in the usual chaos. It is tied to a rarer key-based reward setup, which means the failure feels more expensive the moment it happens. And since Blizzard’s own current Diablo IV patch notes already reference the Mythic Prankster Nightmare Dungeon reward pool, the feature itself is clearly live and relevant in the current season.
What the forum thread actually says
The original report is short, but specific. The player says they located the goblin in the dungeon, tried to kill it, and found that it could not be damaged before it disappeared. They also say this was their first mythic key of this type and asked for the key to be refunded. That part matters, because it frames the issue less as “annoying goblin behavior” and more as “rare seasonal reward consumed, nothing meaningful returned.”
There is an immediate wrinkle, though. A reply in the same thread argues this may not be a literal invulnerability bug at all. According to that response, if a goblin has already been spooked and started its escape sequence, it can remain visible for a few more seconds while no longer being damageable. In that interpretation, the player may have reached the goblin too late rather than hitting a broken enemy state. That does not make the experience feel any better, but it does mean the current evidence points to two possible readings: real bug, or badly communicated goblin escape behavior.
Why this still feels like a real story
Even with that caveat, the story works because the result is the same from the player side: a rare key was spent, the goblin could not be killed when it mattered, and the reward window slammed shut. Blizzard’s forum indexes show the thread surfacing among fresh Diablo IV bug reports on April 3, which at minimum tells you the complaint is current enough to be part of the live season’s bug chatter.
And that lands awkwardly against Blizzard’s broader Season 12 tuning. In the official Diablo IV patch notes, Blizzard already reduced Mythic Prankster Nightmare Dungeon rewards from five Mythic Uniques to one, which means the whole activity has already become less generous than before. So if players now feel they can also lose the run entirely to goblin behavior they cannot clearly read in the moment, the feature starts looking less like a jackpot and more like a slot machine with an attitude problem.
A rare reward should not end with “maybe you were too late”
That is really the issue here. Maybe this turns out to be a misunderstood escape timer rather than a true invulnerability bug. Fine. But then the design still failed in another way, because a player spent a rare key and came away thinking the encounter was broken. In a loot game, that distinction matters less than developers sometimes think. If the goblin is technically working while still feeling completely wrong, players are not going to send thank-you cards to the tooltip team.
