There are a couple AAAH moments I had when dying with hardcore characters that felt really frustrating, and not in an “oh that was challenging” way. These are in order of frustration, from less to “WTF, seriously!?”
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Dropping off ledge using certain runes — a la hoarfrost (likely will be solved from what I read in patch notes)
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Controller died and no temp stall screen or exit from gameplay, so I was killed by a large mob
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Starting the quest for Elsa with NO indication that I would be teleported away to a very high level area — dying, expecting to be “brought back” to the Cerim tomb and then losing my character